flatten group not followed by a project (Fixes #422)
- and fixed the schema in groupBy
- and moved the RenderTree[Grouped] instance to the correct companion obj.
integration test for wildcard with groupBy
Merge remote-tracking branch 'upstream/master' into ready/422
Merge pull request #423 from mossprescott/ready/422

flatten group not followed by a project (Fixes #422)
delete commented line
Merge remote-tracking branch 'upstream/master' into ready/382