[FIXED #72] - Rework the solution to use NuGet package manager

* Use NuGet to retrieve package dependencies. Resolves #72
* Get rid of the built-in NUnit library in winswTests

Signed-off-by: Oleg Nenashev <o.v.nenashev@gmail.com>

src/.nuget/NuGet.Config

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <solution>
+    <add key="disableSourceControlIntegration" value="true" />
+  </solution>
+</configuration>

src/.nuget/NuGet.targets

@@ -0,0 +1,144 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+    <PropertyGroup>
+        <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">$(MSBuildProjectDirectory)\..\</SolutionDir>
+
+        <!-- Enable the restore command to run before builds -->
+        <RestorePackages Condition="  '$(RestorePackages)' == '' ">false</RestorePackages>
+
+        <!-- Property that enables building a package from a project -->
+        <BuildPackage Condition=" '$(BuildPackage)' == '' ">false</BuildPackage>
+
+        <!-- Determines if package restore consent is required to restore packages -->
+        <RequireRestoreConsent Condition=" '$(RequireRestoreConsent)' != 'false' ">true</RequireRestoreConsent>
+
+        <!-- Download NuGet.exe if it does not already exist -->
+        <DownloadNuGetExe Condition=" '$(DownloadNuGetExe)' == '' ">false</DownloadNuGetExe>
+    </PropertyGroup>
+
+    <ItemGroup Condition=" '$(PackageSources)' == '' ">
+        <!-- Package sources used to restore packages. By default, registered sources under %APPDATA%\NuGet\NuGet.Config will be used -->
+        <!-- The official NuGet package source (https://www.nuget.org/api/v2/) will be excluded if package sources are specified and it does not appear in the list -->
+        <!--
+            <PackageSource Include="https://www.nuget.org/api/v2/" />
+            <PackageSource Include="https://my-nuget-source/nuget/" />
+        -->
+    </ItemGroup>
+
+    <PropertyGroup Condition=" '$(OS)' == 'Windows_NT'">
+        <!-- Windows specific commands -->
+        <NuGetToolsPath>$([System.IO.Path]::Combine($(SolutionDir), ".nuget"))</NuGetToolsPath>
+    </PropertyGroup>
+
+    <PropertyGroup Condition=" '$(OS)' != 'Windows_NT'">
+        <!-- We need to launch nuget.exe with the mono command if we're not on windows -->
+        <NuGetToolsPath>$(SolutionDir).nuget</NuGetToolsPath>
+    </PropertyGroup>
+
+    <PropertyGroup>
+        <PackagesProjectConfig Condition=" '$(OS)' == 'Windows_NT'">$(MSBuildProjectDirectory)\packages.$(MSBuildProjectName.Replace(' ', '_')).config</PackagesProjectConfig>
+        <PackagesProjectConfig Condition=" '$(OS)' != 'Windows_NT'">$(MSBuildProjectDirectory)\packages.$(MSBuildProjectName).config</PackagesProjectConfig>
+    </PropertyGroup>
+
+    <PropertyGroup>
+      <PackagesConfig Condition="Exists('$(MSBuildProjectDirectory)\packages.config')">$(MSBuildProjectDirectory)\packages.config</PackagesConfig>
+      <PackagesConfig Condition="Exists('$(PackagesProjectConfig)')">$(PackagesProjectConfig)</PackagesConfig>
+    </PropertyGroup>
+    
+    <PropertyGroup>
+        <!-- NuGet command -->
+        <NuGetExePath Condition=" '$(NuGetExePath)' == '' ">$(NuGetToolsPath)\NuGet.exe</NuGetExePath>
+        <PackageSources Condition=" $(PackageSources) == '' ">@(PackageSource)</PackageSources>
+
+        <NuGetCommand Condition=" '$(OS)' == 'Windows_NT'">"$(NuGetExePath)"</NuGetCommand>
+        <NuGetCommand Condition=" '$(OS)' != 'Windows_NT' ">mono --runtime=v4.0.30319 "$(NuGetExePath)"</NuGetCommand>
+
+        <PackageOutputDir Condition="$(PackageOutputDir) == ''">$(TargetDir.Trim('\\'))</PackageOutputDir>
+
+        <RequireConsentSwitch Condition=" $(RequireRestoreConsent) == 'true' ">-RequireConsent</RequireConsentSwitch>
+        <NonInteractiveSwitch Condition=" '$(VisualStudioVersion)' != '' AND '$(OS)' == 'Windows_NT' ">-NonInteractive</NonInteractiveSwitch>
+
+        <PaddedSolutionDir Condition=" '$(OS)' == 'Windows_NT'">"$(SolutionDir) "</PaddedSolutionDir>
+        <PaddedSolutionDir Condition=" '$(OS)' != 'Windows_NT' ">"$(SolutionDir)"</PaddedSolutionDir>
+
+        <!-- Commands -->
+        <RestoreCommand>$(NuGetCommand) install "$(PackagesConfig)" -source "$(PackageSources)"  $(NonInteractiveSwitch) $(RequireConsentSwitch) -solutionDir $(PaddedSolutionDir)</RestoreCommand>
+        <BuildCommand>$(NuGetCommand) pack "$(ProjectPath)" -Properties "Configuration=$(Configuration);Platform=$(Platform)" $(NonInteractiveSwitch) -OutputDirectory "$(PackageOutputDir)" -symbols</BuildCommand>
+
+        <!-- We need to ensure packages are restored prior to assembly resolve -->
+        <BuildDependsOn Condition="$(RestorePackages) == 'true'">
+            RestorePackages;
+            $(BuildDependsOn);
+        </BuildDependsOn>
+
+        <!-- Make the build depend on restore packages -->
+        <BuildDependsOn Condition="$(BuildPackage) == 'true'">
+            $(BuildDependsOn);
+            BuildPackage;
+        </BuildDependsOn>
+    </PropertyGroup>
+
+    <Target Name="CheckPrerequisites">
+        <!-- Raise an error if we're unable to locate nuget.exe  -->
+        <Error Condition="'$(DownloadNuGetExe)' != 'true' AND !Exists('$(NuGetExePath)')" Text="Unable to locate '$(NuGetExePath)'" />
+        <!--
+        Take advantage of MsBuild's build dependency tracking to make sure that we only ever download nuget.exe once.
+        This effectively acts as a lock that makes sure that the download operation will only happen once and all
+        parallel builds will have to wait for it to complete.
+        -->
+        <MsBuild Targets="_DownloadNuGet" Projects="$(MSBuildThisFileFullPath)" Properties="Configuration=NOT_IMPORTANT;DownloadNuGetExe=$(DownloadNuGetExe)" />
+    </Target>
+
+    <Target Name="_DownloadNuGet">
+        <DownloadNuGet OutputFilename="$(NuGetExePath)" Condition=" '$(DownloadNuGetExe)' == 'true' AND !Exists('$(NuGetExePath)')" />
+    </Target>
+
+    <Target Name="RestorePackages" DependsOnTargets="CheckPrerequisites">        
+        <Exec Command="$(RestoreCommand)"
+              Condition="'$(OS)' != 'Windows_NT' And Exists('$(PackagesConfig)')" />
+
+        <Exec Command="$(RestoreCommand)"
+              LogStandardErrorAsError="true"
+              Condition="'$(OS)' == 'Windows_NT' And Exists('$(PackagesConfig)')" />
+    </Target>
+
+    <Target Name="BuildPackage" DependsOnTargets="CheckPrerequisites">
+        <Exec Command="$(BuildCommand)"
+              Condition=" '$(OS)' != 'Windows_NT' " />
+
+        <Exec Command="$(BuildCommand)"
+              LogStandardErrorAsError="true"
+              Condition=" '$(OS)' == 'Windows_NT' " />
+    </Target>
+
+    <UsingTask TaskName="DownloadNuGet" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
+        <ParameterGroup>
+            <OutputFilename ParameterType="System.String" Required="true" />
+        </ParameterGroup>
+        <Task>
+            <Reference Include="System.Core" />
+            <Using Namespace="System" />
+            <Using Namespace="System.IO" />
+            <Using Namespace="System.Net" />
+            <Using Namespace="Microsoft.Build.Framework" />
+            <Using Namespace="Microsoft.Build.Utilities" />
+            <Code Type="Fragment" Language="cs">
+                <![CDATA[
+                try {
+                    OutputFilename = Path.GetFullPath(OutputFilename);
+
+                    Log.LogMessage("Downloading latest version of NuGet.exe...");
+                    WebClient webClient = new WebClient();
+                    webClient.DownloadFile("https://www.nuget.org/nuget.exe", OutputFilename);
+
+                    return true;
+                }
+                catch (Exception ex) {
+                    Log.LogErrorFromException(ex);
+                    return false;
+                }
+            ]]>
+            </Code>
+        </Task>
+    </UsingTask>
+</Project>

src/Test/winswTests/packages.config

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="NUnit" version="2.6.4" targetFramework="net20" />
+</packages>

src/Test/winswTests/winswTests.csproj

@@ -17,6 +17,8 @@
     <UpgradeBackupLocation>
     </UpgradeBackupLocation>
     <OldToolsVersion>3.5</OldToolsVersion>
+    <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">..\..\</SolutionDir>
+    <RestorePackages>true</RestorePackages>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>
@@ -36,9 +38,9 @@
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="nunit.framework, Version=2.6.2.12296, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77, processorArchitecture=MSIL">
+    <Reference Include="nunit.framework, Version=2.6.4.14350, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
-      <HintPath>..\Lib\nunit.framework.dll</HintPath>
+      <HintPath>..\..\packages\NUnit.2.6.4\lib\nunit.framework.dll</HintPath>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Data" />
@@ -54,7 +56,17 @@
       <Name>winsw</Name>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('$(SolutionDir)\.nuget\NuGet.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\.nuget\NuGet.targets'))" />
+  </Target>
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
   <Target Name="BeforeBuild">

src/packages/repositories.config

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<repositories>
+  <repository path="..\Test\winswTests\packages.config" />
+</repositories>

src/winsw.sln

@@ -7,6 +7,13 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "winsw", "Core\ServiceWrappe
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "winswTests", "Test\winswTests\winswTests.csproj", "{93843402-842B-44B4-B303-AEE829BE0B43}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = ".nuget", ".nuget", "{6BDF4025-D46C-4C69-BDB2-5CE434C857AA}"
+	ProjectSection(SolutionItems) = preProject
+		.nuget\NuGet.Config = .nuget\NuGet.Config
+		.nuget\NuGet.exe = .nuget\NuGet.exe
+		.nuget\NuGet.targets = .nuget\NuGet.targets
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU