Move GraphToDSCompiler to Legacy folder
Remove some obsolete functions
Merge pull request #2863 from ke-yu/cleanup

Remove some obsolete functions
Merge pull request #2850 from ke-yu/MoveGraphToDSCompiler

Move GraphToDSCompiler to Legacy folder
Merge branch 'master' into Revit2015
Merge pull request #2867 from ke-yu/Revit2015

Cross merge master into Revit2015