Added OmniAuth & OmniAuth Facebook gems
conflict resolution
Added facebook initializer for Omniauth
Added Sign In with Facebook link, omniauthable in user model
installed figaro gem
Initialized figaro & ENV variables, created OmniAuth callbacks controller, added migration for oauth fields to user table
Filled out callbacks controller
Added name column to Users table
Added Users subfolder in controllers, moved omniauth callback controller in
implemented facebook login
Added user log in greeting
leftover updates from last commit
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