Added new UI Images
Added Mircrosoft.Shell.dll and references to project
Implemented frameless window in Dynamo
Refactoring: change factory methods in AstBuilder to static
Implement Concats node
1. "Dynamo.CS.props" now falls back on "Vasari Beta 3" if "Revit 2014" doesn't exist
2. Fixed a typo in "FScheme.2012.fsproj" so "Dynamo.CS.props" is properly imported
3. Merged more changes from "Dynamo.sln" into "Dynamo.2012.sln"
Updated grid styling
Add an Execute() to AstBuilder to run AST nodes
Temporary made "DynamoSandbox" build in "Any CPU" instead of "x64"
1. Implemented "XmlElementHelper" class to abstract codes that deal with XmlAttribute
2. Added all test cases for "XmlElementHelper" class in "XmlHelperTests.cs"
Generating AST for more nodes
updated descriptions
Revit testing script calls sys.exit.
geometry association removed when dynamo closes

fix for #427
closing the window with the X button still cleans
cancel button on save prompt now cancels close
better name for recursive output
moved custom node tests to their own file
Enable sandbox build in Debug and Release configurations and set to AnyCPU.
Add more data to the nunit results.