Remove most Build() methods, AstBuilder would be deprecate soon
Merge remote-tracking branch 'upstream/ChocoButter' into ChocoButter
Remove unnecessary AST build methods from AstBuilder
Merge pull request #454 from ke-yu/ChocoButter

Remove most Build methods from AstBuilder as well as from Dynamo nodes
added and implemented RevitServices project
updated controller to use RevitServices
added RevitServicesTests project
cleaned up TryGetElement code

Conflicts:
	src/DynamoRevit/DynamoController_Revit.cs
	src/DynamoRevit/Nodes/Annotation.cs
	src/DynamoRevit/Nodes/dynCurves.cs
	src/DynamoRevit/Nodes/dynDatums.cs
	src/DynamoRevit/Nodes/dynFamilies.cs
	src/DynamoRevit/Nodes/dynViews.cs
build fix
element validity checks now use RevitServices
added RevitServices unit tests
updated build settings to use props file
Merge pull request #514 from ikeough/RevitServices

Refactored Transaction management and element validity checking into separate RevitServices library
dynDSFunction node supports multiple outputs
Update DesignScript dlls
Add type to DSFunction node
Merge fix from master to ChocoButter
Merge fix (from master)
Merge fix: remove obsolete file and project ref
Basic functionality to display imported library items