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'
Improves Batcher.unit, tests, and adds CombinedBatcher
add option map, not flatMap
Merge pull request #194 from twitter/feature/option_map

add optionMap
Address some of Sam's comments
Merge pull request #193 from twitter/batch-combine

Improves Batcher.unit, tests, and adds CombinedBatcher
0.1.0
indentation
Merge branch 'release/0.1.0'

Conflicts:
	project/Build.scala
	summingbird-core/src/main/scala/com/twitter/summingbird/scalding/FlatMapOperation.scala
Merge branch 'release/0.1.0' into develop
Adds the calendar batcher
Add the ability to ignore errors
Merge pull request #196 from twitter/error-for-ashu

Add the ability to ignore errors
Bump version
Merge branch 'release/0.1.1'