Added PatternLayout for ActivityLogAppender
Fix for https://github.com/ppittle/pMixins/issues/11 (Don't eagerly load project references on ProjectAdded)
Added performance logging
Changed how Code Behind files are written - Use an EmptySingleFileCodeGenerator to create the file and add it Solution, and then overwrite that file.
Added empty test stub
Created infrastructure for Expected Errors tests and initial tests
Cleaned up whitespace
Updated MockSolution Tests to use new CodeBehindFileHelper
Added / organized Tests