added User model
added session lookup and caching
re-added index, header, and footer
adding assets and stylesheets
css footer and body styles
finished auth, and redirect to index.
added tweets controller and model, along with Twitter gem.
migrated tweet model data
added additional styling
styling added to button, and top-bar
added more styles/
functioning index page, sign in, and routes
fixing errors
committing pull-request merge