Update CONTRIBUTING.md

Updated CONTRIBUTING.md to specify that the `this` keyword should be avoided.
Fixes #35: Solution file should be located in the root of the repository
Update README.md
Update README.md
Update README.md
Update README.md

Add links to Google Groups and JabbR
Update README.md

Add a link to the samples repository
Remove samples directory
Merge branch 'master' of github.com:scriptcs/scriptcs

* 'master' of github.com:scriptcs/scriptcs:
  Update README.md
Reset the CommonVersionInfo file content
Use all lowercase characters for the chocolatey package ID
Rename Scriptcs.nuspec to scriptcs.nuspec
Paths should not be declared using static functions
Create the artifacts directory after cleaning it
Change OutputPath back to the default location
Replace tabs with spaces in chocolateyinstall.ps1
# Configured log4net in console application and registered log in AutoFac
# Initial debugging messages for FilePreProcessor.cs, RoslynScriptDebuggerEngine.cs and RoslynScriptEngine.cs
Create chocolateyUninstall.ps1
scriptcs.nuspec should assume the working directory is the project directory