mod. update authors
fix. 'revert_rate_user_revs_query' should return rev_id.
fix. bug in revert_rate.  Historics revs should be ordered by descending rev_id.
add. test for RevertRate.

Change-Id: Ia93567569c604564c30a3e76371c03570b2305b7
Merge pull request #28 from rfaulkner/working

Fixes and test.