Added a new code based auth middleware.
Added canvas check logic to decorator.
Added FANDJANGO_SITE_URL setting for non-canvas sites.
Added redirect to remove fb query params
Moved code param redirect from middleware to decorator.
Removed authorize_application redirect from middleware.
Will instead occur in the decorator,
Merge branch 'master' of github.com:jgorset/fandjango into non-canvas-middleware

Conflicts:
	fandjango/middleware.py
Added signed_request check before setting cookie.
Removed unused imports.
Restructured tests into separate classes.
Added tests for FacebookWebMiddleware
Moved query param removal to middleware process response.
Removed Dupe middleware.
Test fixes.
Added remove query param test.
Added tests for running middlewares in parallel.
Moved access denied check to base class.
Added docs
decorator canvas var is now boolean.
Fix whereby signed request authed used was being redirected.
Re structured process_responses.
Querystrings are now correctly removed.
Re-ordered check to see if alternate middleware has been used.
Flattened code logic.