Update mocks for heka dev.
Merge branch 'master' into dev
Merge branch 'master' into dev
Heka Issue 226 Redesign of the message field metadata
Merge pull request #10 from mozilla-services/issue_226

Heka Issue 226 Redesign of the message field metadata
Merge branch 'dev' into features/decouple-statmonitor
Use new `h.StatAccumulator()` method instead of doing it ourselves.