change start page's samples list box to treeView. Added show samples in folder
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into treeView
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into treeView
Change some code format, function name
Refactored "DynamoModel.Reset" and "ResetEngine" methods
Merge branch 'ResetEngine' of https://github.com/Benglin/Dynamo into ResetEngine
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into ResetEngine
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into ResetEngine
Merge pull request #2351 from Randy-Ma/master

Fix MAGN-4522 When building Dynamo using visual studio, DynamoSandbox does not open, if there is no folder Autodesk in programfiles
Merge pull request #2294 from theanh0512/treeView

Change start page's samples list box to treeView
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into ResetEngine
add if statement to check whether sampleFiles got any element
Reorganized if Statement
Merge pull request #2355 from theanh0512/treeViewFix

add if statement to check whether sampleFiles got any element
Addition of flaky test marker to retrigger a build
Merge pull request #2322 from Benglin/ResetEngine

Refactored "DynamoModel.Reset" and "ResetEngine" methods
Avoid null reference when processing element lookup.

Conflicts:
	src/Libraries/Revit/RevitNodesUI/Selection.cs
Use AddRange instead of ForEach.

Conflicts:
	src/Libraries/Revit/RevitNodesUI/Selection.cs
MAGN-4395: Topology vertices incorrect for Solid
Merge branch 'master' into Revit2015