Add's a proxy batched store, pruning, and a test for pruning
Merge branch 'refs/heads/feature/modularize_scalding_platform' into feature/add_pruning_support
Merge branch 'refs/heads/feature/modularize_scalding_platform' into feature/add_pruning_support
Merge branch 'develop' of github.com:twitter/summingbird into feature/add_pruning_support
Merge pull request #435 from twitter/feature/add_pruning_support

Feature/add pruning support