Update to take the change of MultiReturnAttribute
Make use of IsVisibleInDynamoLibraryAttribute
Merge branch 'ChocoButter-2Become1' of github.com:DynamoDS/Dynamo into ChocoButter-2Become1
Merge pull request #1308 from Randy-Ma/ChocoButter-2Become1

Update to take the change of MultiReturnAttribute and make use of IsVisibleInDynamoLibraryAttribute