Fixed issue with seemingly cached form results for RackFilterForm Bug #827420
Added system type tracking to systems. [859739]
Added system type to system display page. [859739]
Merge branch 'mozilla-prod'

Conflicts:
	systems/forms.py
Merge branch 'master' of github.com:rtucker-mozilla/mozilla_inventory into rtucker_master
pep8 and some clean up
added system warranty start/end

See bug https://bugzilla.mozilla.org/show_bug.cgi?id=850836
added data/schema migration for system_type