adds cancan permissions library
generates `ability` class for cancan
adds better_errors gem to help with debugging on dev
updates sessions to improve user routing when logging in and out
sets up cancan and restrictions around quotations management
trims json handling in Quote where it will probably not be used
removes quotes#index cancan authorization in favor of class-level auth
adds error handling for cancan violations
Merge branch 'master' into cancan

This pulls in the static home page from the master branch
updates sessions controller to send user to home page on logout
restores sessions redirect to root
Merge pull request #8 from feastongood/cancan

Adds Cancan

Moving forward, user rights need to be managed via the ability class.