update to StyleCop.MSBuild.4.7.48.0
updated testing packages
reformatted rakefile variable assignments and added vars task
updated to Castle.Core.3.2.2 and ilmerge.2.13.0307
fixes #236
switched test projects back to FakeItEasy.Guard from NUnit.Framework.Guard
Merge pull request #241 from adamralph/update-packages

Update packages