lots of changes please read log

Hey guys!! If you merge/pull this, please be aware that I made quite a few changes.

-First and foremost, I have included the environment variables for Twitter that you will have to include as your own environment variables. Also please do a bundle install and a db:migrate.

-"Likes" for shoutouts is sorta working. It is operating as we want it to, I just need to add some further constraints so that users cannot like the same shoutout twice (should be super easy; iterate over a shoutout's likes' user_id column to see if current user.id matches, and reject if so)

-I have brought in Rufus to help us with scheduling our scraping on GA's website. The site moves much more quickly now.