Fixed bug caused from updating devise. Also added paypal sdk
Fixed bug with submitting essays
Added payments controller
Added paypal button to payments page
Added extra content to payments page
Link to payments in flash message when user does not have enough gems
Made sticky footer
Paypal express checkout
Change flow of payment by adding payment confirmation and success page. Change api of paypal interface to provide completion blocks.
Changed layout of confirmation page and redirect user to profile page after successful payment.
Added confirmation prompt before user can delete an essay
Added api credentials for live
Merge branch 'develop'