1) Move up to Jackson 2.1
2) Some bugs were fixed, but they ended up getting mixed in with the Jackson upgrade :(
DeterminePartitionsJob: Select partition dimension to minimize segment size variance when cardinality is low
Merge pull request #86 from metamx/dimpartition-by-variance

Select partition dimension by variance when cardinality is low
DeterminePartitionsJob: Fix docs
Merge branch 'master' into speedup-timeboundary