Clean up Milestone#percent_complete.
Clean up Milestone#percent_complete.

xuewenfei/jobsworth,arunagw/clockingit,rafaspinola/jobsworth,rafaspinola/jobsworth,xuewenfei/jobsworth,rafaspinola/jobsworth,ari/jobsworth,webstream-io/jobsworth,xuewenfei/jobsworth,ari/jobsworth,webstream-io/jobsworth,ari/jobsworth,digitalnatives/jobsworth,digitalnatives/jobsworth,evinoca/clockingit,digitalnatives/jobsworth,evinoca/clockingit,arunagw/clockingit,evinoca/clockingit,digitalnatives/jobsworth,xuewenfei/jobsworth,rafaspinola/jobsworth,webstream-io/jobsworth,evinoca/clockingit,webstream-io/jobsworth,digitalnatives/jobsworth,ari/jobsworth,arunagw/clockingit