switched to non-destructive json datetime encoding
Review fixes r=selenamarie
* Fix small whitespace error in hb/crashstorage.py
* Add missing cls= to dumps call
Merge pull request #1883 from selenamarie/bug972037-es-error-cuz-json-transform

Bug972037 ElasticSearch error because of destructive JSON transform
restored my ill fated json change to hb.crashstorage
Merge pull request #1884 from twobraids/dt-hb

fixes Bug 972937 (really!)  rolledback my ill fated json change to hb.crashstorage
fix bug 972165 - group by buildid, and also don't both with count query
Merge pull request #1885 from rhelmer/bug972165-gccrashes-adjustments

fix bug 972165 - group by buildid, and also don't both with count query
fixes bug 971940 - 'unicode' is not a type we can check something is NOT, r=rhelmer