created user model
Merge branch 'master' of https://github.com/UberMouse/bitter into login
create registration, login directs to profile page
Merge pull request #1 from UberMouse/login

Login
Merge branch 'master' of https://github.com/UberMouse/bitter into create_a_tweet
enabled sessions
Sessions already enabled in environment
Merge pull request #2 from UberMouse/sessions

enabled sessions
Deleted some junk
Merge branch 'master' of https://github.com/UberMouse/bitter into create_a_tweet
Use User model when creating tweets