Moved ResolveInterceptorMixinRequirements to separate step
Added Test to make sure pMixins doesn't interfere with a normal compilation of partial classes that don't use the framework
https://github.com/ppittle/pMixins/issues/30

Custom PMixin Attributes support
Updated version of pMixins dll (generated code now contains [MixedInMember] attribute, so CanGenerateCodeWhenProjectReferencesOldVersionOfPMixins was failing.