Change the requirement to Django 1.2 in documentation

[nduthoit]

http://dcramer.github.com/django-sentry/install.html#requirements shows Django>=1.1 but AFAIK the requirement is Django 1.2 (got an error on loading csrf context_processor with 1.1)

[dcramer]

I'd love to get this fixed to be compatible with 1.1. If anyone has the time or know-how for the csrf context processor, I think we're compatible in other parts.

[adamn]

Why not just update the dependency to 1.2 and close the ticket. Somebody else should open up a 1.1 ticket if they want it. I think most potential users of sentry are on 1.2+

[dcramer]

Bump requirement to Django 1.2 (closed by cb7ed4d)