Merge branch 'dev'

* dev:
  Fixes #201. PowerArgs updated to 1.5.0.0
  Added assertions on Commands.Count for CompositeCommands, changed to ShouldImplement instead of casting
  Added save command to -clean and -install (if no packages.config)
  Removed possible NullReferenceException on newestFramework
  Fixes #193. DirectoryCatalog is not initialized if script name isn't passed.
  Chocolatey install updated to mention new PowerArgs version.
  NuGet PowerArgs package updated.
  Added filter on .NETFramework
  Made PackageContainer pick the newest supported framework for the packages. Could fix #185
  Updated Autofac/MEF integration to 3.0.1 (resolving issue outlined in #182).
  Adding EXEs as valid assemblies.
  Update version to v0.3.2
Bundle all dependencies, except Roslyn, in the scriptcs chocolatey package
Merge branch 'dev'

* dev:
  Bundle all dependencies, except Roslyn, in the scriptcs chocolatey package
Merge branch 'master' into dev

* master:
Merge branch 'dev' into fix-r-directive