CBN related tests
add tests
Merge remote-tracking branch 'upstream/ChocoButter' into myChoco

Conflicts:
	src/DynamoElementsTests/DSEvaluationTest.cs
add link to deffect
fix test
Update DS dlls to stablilized version
Merge pull request #759 from ambarish-prakash/CBNTextIssue

In view of the extent of this problem (it causes all WPF text boxes on Dynamo to be not clickable), I am accepting this merge :)
Merge pull request #757 from monikaprabhu/myChoco

My choco
Merge pull request #758 from junmendoza/ChocoButter

Update DS dlls to stablilized version
Some comments change and code refactoring
update of dlls + caching of ast nodes
Copy Constructor to clone cached astNodes
CBN Text Size fix
CBN TextBox wrap
Update of design script dlls