Remove unused function and update docs

doc.go

@@ -1,10 +1,39 @@
 /*
-Package filemanager provides a web interface to access
-your files wherever you are.
+Package filemanager provides a web interface to access your files
+wherever you are. To use this package as a middleware for your app,
+you'll need to create a filemanager instance:
 
-To use this package, you'll need to start by creating a
-filemanager instance:
+	m, err := filemanager.New(database, user)
 
-	fm, err := New(database, user)
+Where 'user' contains the default options for new users. You can just
+use 'filemanager.DefaultUser'
+
+Then, you should set the Prefix URL and the Base URL, using the following
+functions:
+
+	m.SetBaseURL("/")
+	m.SetPrefixURL("/")
+
+The Prefix URL is a part of the path that is already stripped from the
+r.URL.Path variable before the request arrives to File Manager's handler.
+This is a function that will rarely be used. You can see one example on Caddy
+filemanager plugin.
+
+The Base URL is the URL path where you want File Manager to be available in. If
+you want to be available at the root path, you should call:
+
+	m.SetBaseURL("/")
+
+But if you want to access it at '/admin', you would call:
+
+	m.SetBaseURL("/admin")
+
+Now, that you already have a File Manager instance created, you just need to
+add it to your handlers using m.ServeHTTP which is compatible to http.Handler.
+We also have a m.ServeWithErrorsHTTP that returns the status code and an error.
+
+One simple implementation for this, at port 80, in the root of the domain, would be:
+
+	http.ListenAndServe(":80", m)
 */
 package filemanager