Added reviews counter_cache
Merge pull request #49 from groupbuddies/jj-review-counter-cache

Added reviews counter_cache
Added .env to Capistrano's list of linked files
Added dotenv-rails gem to production as well
HOTFIX: added isbn to permitted attributes
Added rake task to update all covers based on isbn
Refactored cover rake tasks
Fixed rake task
Updated cover update task
Updated rake task
Upgraded RSpec to 3.1
Migrated from cucumber to turnip
Added 200ms delay to search ajax call
User can add an ebook
Extend loan period
Show extend button only when extendable

* Only shows one week before the ending of the loan
* Can only be extended once
Notifies user that she can only renew once

* Show the expiration date for a loan on my shelf
Rebased with master