Make Producer covariant
Move the Planner code into core
Fixup tests
Fix imports
Reversed, not revsersed
Merge remote-tracking branch 'origin/feature/storm_new_planner' into feature/move_dag_to_core

Conflicts:
	summingbird-storm/src/main/scala/com/twitter/summingbird/storm/PlannedTopology.scala
	summingbird-storm/src/main/scala/com/twitter/summingbird/storm/StormPlatform.scala
	summingbird-storm/src/test/scala/com/twitter/summingbird/storm/TopologyPlannerLaws.scala
Update to newer code
Merge branch 'develop' of github.com:twitter/summingbird into feature/move_dag_to_core
Fix for comments
Merge pull request #255 from twitter/feature/move_dag_to_core

Feature/move dag to core