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
Removed packages.config from project
Merge remote-tracking branch 'upstream/dev' into dev
Merge remote-tracking branch 'upstream/dev' into dev
Initial commit for -restore and -install revamp
Fixed failing tests
Minor test refactoring
Added version information

Version is now displayed whenever ScriptCs is launched.
Changed -restore flag too bool and removed IDisposable on ScriptPackSession
Added CompositeCommand for combining commands, -restore should now be provided with a script name to restore before executing the script
#132 Version flag as a command

Specifying -version or -v will output version information.
#132 Version flag as a command