Adding outputting return values
scriptcs Chocolatey package should depend on the NuGet.CommandLine package
Update CONTRIBUTING.md
Merge pull request #235 from glennblock/232

Adding dumping return values in the REPL #232
Merge pull request #240 from jrusbatch/issues/239

Fixes #239: scriptcs Chocolatey package should depend on the NuGet.CommandLine package
Merged in latest changes from dev