Reset Migrations / Drop references to hstore

[unbracketed]

We removed use of django-hstore since it was problematic in production. Unfortunately the initial migration definitions reference hstore. We should reset the migrations or manually patch the migration files

[yml]

The plan is to reset the migration when we move to django 1.7.

[gaker]

addressed here: https://github.com/BotBotMe/botbot-web/pull/97

[gaker]

6ba4a13e95e4399d2b3c2f75b422b2c63adb630d