Compile to null expression for proxy custom node instance
Get custom node instance based on FunctionId
Mark custom node instance as dirty when realoding definition
Add regression test
Move compilation from Function to CustomNodeController
Fix MAGN-3711 Support floor creation for structural types
Implement Equals() on CustomNodeDefinition
Merge pull request #3347 from Randy-Ma/magn-3711

Fix MAGN-3711 Support floor creation for structural types
Merge pull request #3346 from ke-yu/fix_magn5555

Fix magn-5555: proxy custom node causes the whole graph evaluates to null
Merge branch 'master' into Revit2015
Merge pull request #3366 from ke-yu/Revit2015

Merge master into Revit2015