Revit2015 Merging ProtoCore to REvit2015

@Benglin @ke-yu @Randy-Ma 

I need help reviewing this.
I only want this commit: https://github.com/junmendoza/Dynamo/commit/1f566f689f5a286e5c2e9eb21a2ed6696400740a

But after creating the PR, these are the affected files.
Does it look correct?