Fix MAGN-3037 Port XyzAverage
Merge branch 'master' of github.com:DynamoDS/Dynamo
Merge branch 'master' of https://github.com/Randy-Ma/Dynamo
Merge branch 'master' of github.com:DynamoDS/Dynamo
Added a test case for XyzAverage migration
Merge branch 'XyzAverageTest' of https://github.com/ellensi/Dynamo
Merge pull request #1520 from Randy-Ma/master

Fix MAGN-3037 Port XyzAverage