Merge pull request #6 from mozilla/master

Mostly Tastypie Stuff
Merge pull request #8 from mozilla/master

automatic south migrations
Merge branch 'prod' of github.com:mozilla/inventory into prod
fixed oncall
fixed oncall again
Fixed regression with system show template

whoops. https://bugzilla.mozilla.org/show_bug.cgi?id=847562
added more fields that were removed.