update playdoh for latest django security release
Merge pull request #220 from ryanpitts/development

update playdoh for latest django security release
remove djcelery from installed apps, throwing migration error and we aren't using it
Merge pull request #221 from ryanpitts/development

remove djcelery from installed apps, throwing migration error and we are...
Merge pull request #222 from mozilla/development

udpate playdoh for latest django security release