Remove uses of java.util.Date, use more Timestamp, and replace some Long usages too
Fix up more tests
Add Timestamp.Max, Timestamp.Min
Add prev and next to Timestamp
Add toDate to the Timestamp
Address comments on github
Move arbitary timestamp to the right file
Added test for batcher's currentBatch, fixed bug
Fix up some more tests
More Date -> Timestamp, add a Timestamp.now
Merge pull request #295 from twitter/feature/remove_java_util_date

Feature/remove java util date