Merge pull request #30 from singhala/master

allow versionsToKeep to be set in VersionedStore (hotfix, master)
bump version to 0.0.6 hotfix for Ashu
Force cascading node materialization before write
Merge pull request #99 from twitter/render_on_write

Render on write
Bond, James Bond
Merge branch 'hotfix/0.0.7'
Merge branch 'release/0.1.0'

Conflicts:
	project/Build.scala
	summingbird-core/src/main/scala/com/twitter/summingbird/scalding/FlatMapOperation.scala
Merge branch 'release/0.1.1'
Merge branch 'develop' of github.com:twitter/summingbird into develop