Add parquet-scrooge sources
Add parquet scrooge module to aggregate project so that its tests are run on the CI
Make parquet-scrooge 2.10 only
Add parquet-scrooge to travis.yml
rm scala 2.9 parquet-scrooge tests from travis.yml
Merge pull request #1065 from aposwolsky/develop

Outer join handles case when both are empty
Merge pull request #1064 from twitter/alexlevenson/parquet-scrooge

Add parquet-scrooge sources
Bump to 0.12.0rc4
only request necessary hadoop configs in hraven reducer estimator
Merge pull request #1067 from twitter/amatsukawa/reducer_estimator_filter_config

Only request necessary hadoop configs in hraven reducer estimator
Enforce invariant: mapGroup iterators all nonempty

Previously not all fixes in mapGroup were covered