Update django-taggit from 0.9.3 -> 0.11.2
Update django-taggit from 0.9.3 -> 0.11.2

For Django 1.6 compatibility.

pyconau2017/symposion,pydata/symposion,euroscipy/symposion,euroscipy/symposion,pinax/symposion,toulibre/symposion,faulteh/symposion,pyohio/symposion,toulibre/symposion,miurahr/symposion,pydata/symposion,pyohio/symposion,pinax/symposion,pyconau2017/symposion,miurahr/symposion,faulteh/symposion