Added updater.sh shell script (#620)

Saves config.php. Updates the rest of the files to the latest Github release.

CHANGELOG.rst

@@ -5,6 +5,7 @@ Changelog
 Not yet released
 ----------------
 
+* #620: Added updater.sh shell script.
 * #653: Fixes wrong default type in upgrade/install query.
 * #642: Added post field as addition to #631.
 * #644: Fixed urlencoding in Nexmo message

updater.sh

@@ -0,0 +1,71 @@
+#phpservermonitor updater
+# Developed by petrk94 - https://github.com/petrk94
+#
+# requirements 
+# PHP
+# cURL
+# grep
+# unzip
+#
+# used code:
+# cURL github API url: https://stackoverflow.com/questions/24987542/is-there-a-link-to-github-for-downloading-a-file-in-the-latest-release-of-a-repo
+
+echo .......... PHPSERVERMON UPDATER ..........
+
+# check if updater is executed from within the phpservermon directory
+if [ ! -f ./updater.sh ]; then 
+    echo STOPPED: don\'t execute the updater from another directory!
+    exit
+else
+    echo Start updating
+fi
+
+# get latest version
+version=$(curl -s https://api.github.com/repos/phpservermon/phpservermon/releases/latest | grep browser_download_url | cut -d '/' -f 8)
+echo Downloading latest Version of PHPServerMonitor \($version\)
+
+# get download URL
+downloadfile=$(curl -s https://api.github.com/repos/phpservermon/phpservermon/releases/latest | grep "zipball" | cut -d '"' -f 4)
+
+# download latest release
+wget -O update.zip.keep $downloadfile
+# Check if wget is installed
+if ! [ $? -eq 0 ]
+then
+   echo "wget not installed"
+   exit
+fi
+
+echo Save config.php 
+mv config.php config.php.keep
+echo done!
+
+# remove old files except config.php.keep
+echo Removing old files...
+find . -type f ! -iname "*.keep" -delete
+rm -rf cron/ docs/ puphpet/ src/ static/
+
+echo OK
+
+# unzip update file
+mv update.zip.keep update.zip
+unzip update.zip
+
+# move all files and directories from new created phpservermon directory, to the directory above with the native phpservermon installation
+mv phpservermon*/* .
+# remove phpservermon directory
+rm -rf phpservermon*
+# remove zip file
+rm update.zip
+# restore original config.php back from config.php.keep
+mv config.php.keep config.php
+
+# run php composer.phar install or update
+if [ -d "vendor" ]; then
+    php composer.phar update
+else
+    php composer.phar install
+fi
+
+echo Update finished!
+echo Please finish the installation in your browser.