Added call for post permissions in devise.rb
Changed notification refresh to 30 sec. Modified from_auth method to fetch a 60-day token for fb
Added devise sanitize params for sign in for fb params
Added option to login with username or password
added fb sdk and like/share btn to challenges/index
Added friend permission req to fb login
Added intro page, added send btn to challenge#show, like btn to index
Played with intro page and challenge layout
Changed redirect after sign in.out to challenges.index
Added animation to soritng challenges with animate.css
Fixed one feature spec, made fb send links from challenge#show valid