Merge pull request #25 from bf4/twitter-gem-yanked

Twitter gem yanked, get from github repository
Merge pull request #26 from bf4/mini_magick

use Mini Magick instead of RMagick. It's just easier
Update gitignore
Remove rails_config as it is not used
Use figaro to set configs using ENV, which the app relies on
Add figaro config example
Update readme on how to set up app
Make the secret token a secret