Updated README with link to hosted instance
Added a gitignore
Added info about Heroku deployment to README
Added link to Heroku page of wiki to README
Moved storage of user preferences into user's Tent server.
Added a Prefs class to simplify preferences handling
Added a signout page
Added some css
Renamed views.py to routes.py
Fixed import of new routes file
Reworked a lot of the flow for authentication
Updated process_feeds.py to work with preferences stored in the Tent
server.
Added plugin architechture and support for essays
Merge branch 'master' into heroku

Conflicts:
	db/schema.sql
	smokesignals/models/user.py
	smokesignals/process_feeds.py
	smokesignals/routes.py
Updated home page to mention essay capability.
Removed Feed and FeedItem models
Added stuff about post types to README
Also made it easier to add new post types
Merge branch 'master' into heroku