update playdoh template to latest playdoh-lib with django 1.5.5

[willkg]

The playdoh template needs to be updated to the latest playdoh-lib with Django 1.5.5.

I spent 5 minutes looking into this. I think, this requires us to add ALLOWED_HOSTS to settings. It's possible it requires other things beyond that.

[peterbe]

Oh. We already upgraded to django 1.5.6 here. I guess the missing link is to put a note in settings/local.py-dist about ALLOWED_HOSTS.