Add a method to prepare for optimizing FlatMapKeys
refactor HDFSState
Add an optional parameter to set default parallelism for a storm source
better tests
add comment on defensiveness.
Remove unused
better temp paths
better error messages
tidy tests
revert change to waitingstate case match
Incorporate review comments
Merge branch 'develop' into transOutput
Split the implicits, others stop having defaults to make the two signatures more explicit
Eliminate overloading warnings
Remove compiler warning
Merge branch 'develop' into transOutput

Conflicts:
	summingbird-core/src/main/scala/com/twitter/summingbird/Dependants.scala
depthFirstOf stores traversals in a List vs. Vector
change name.
bump
change names.