Move generic serializer fields used in collections to mkt.api.fields
Convert StatusResource to DRF (bug 910621)
Merge pull request #1406 from diox/convert-statusresource-to-drf

 Convert StatusResource to DRF (bug 910621)
Fix reversing of prices API url (bug 942872)
Remove app_to_dict and AppResource, add AppSerializer and AppViewSet
fireplace too
fix up links, and changes in output
convert InstalledResource (bug 910554)
Fix other uses of AppResource
remove CompatRelatedField
 Remove unused fields from Fireplace app API (bug 900568)