Update to Chill 0.3.1
Add test for Kryo with WrappedArray (which was failing in Chill 0.3.0)
Merge pull request #797 from mateiz/chill-0.3.1

Update to Chill 0.3.1
Fixed a typo in mllib inline documentation.
Optimize JavaPageRank to use reduceByKey instead of groupByKey