Merge branch 'release/0.1.2'
closes #207
Better forking.
Merge pull request #209 from twitter/feature/empty_multiget

Fix Empty MultiGet Issue
Fix storm planner bug with forks
add a simpler write to the sourcebuilder
change name.
Merge pull request #217 from twitter/feature/storm_planner_change

Fix Storm Planner Bug
bump versions
Merge branch 'release/0.1.3'
Merge branch 'release/0.1.3' into develop
Adds the old summing join back

Useful for more efficient joins with stores
Merge pull request #218 from twitter/sumjoin

Adds the old summing join back
Reverts the StoreIntermediate to the old approach.

Jobs need to use BatchedService.fromStoreAndDeltaSink with this
Merge pull request #219 from twitter/optimizeStoreJoin

Reverts the StoreIntermediate to the old approach.
Add dot graph generation from a summing bird graph.

Use with
  import com.twitter.summingbird.viz.BaseViz

    val writer = new PrintWriter(new File("/tmp/output.dot"))
  BaseViz(node, writer)
    writer.close()
push down storm filters
address oscar comments
remove helpers and comments
Push the graph val back private in Dependants.
Add a nodes function to return the set of keys in the Dependants graph.