Merge branch 'master' of github.com:DynamoDS/Dynamo into Revit2015
Fix unstability caused by one test fixture
Fixed failing Tests due to missing Custom Node.
Merge pull request #2539 from Randy-Ma/master

Fix unstability caused by one test fixture
Merge branch 'Revit2015' of github.com:DynamoDS/Dynamo into Revit2015
Merge branch 'master' into Revit2015
Merge pull request #2547 from Randy-Ma/Revit2015

Merge the master branch to the Revit2015 branch