Bug 898179 - Return 503 for /status failures
Merge branch 'moz_master'
Merge branch 'master' of github.com:mozilla-services/campaign_manager
Switch from metlog to heka
revert etype; call __builtin__.type()
Added Heka support; last-modified header.

* switch from metlog to heka
* revert etype fix to call __builtin__
* use Last-Modified for EARLIEST returned record.
* formatting
add heka to prod-reqs.txt
Merge pull request #5 from jrconlin/master

Bugs 912111, 898179 & logging