Updated content.json: ref to bigocheatsheet.com

Big-O Algorithm Complexity Cheat Sheet
Updated content.json: Data structures link to Rosetta Code
Updated content.json: line noise
added "Learning Javascript Design Patterns" by Addy Osmani as a Hard javascript link
Added CakePHP
Merge pull request #88 from westurner/gh-pages

Updated content.json: refs to big-o cheatsheet, rosetta code
Added levels for rosetta
Merge pull request #92 from illourr/gh-pages

added "Learning Javascript Design Patterns" by Addy Osmani as a Hard level JS link.
Merge pull request #93 from bcrowe/feature-addCakephp

Added CakePHP
Merge pull request #94 from agsdot/gh-pages

Add link to the Groovy Goodness blog for the Groovy community
cakephp
Merge branch 'gh-pages' of https://github.com/JonHMChan/bento into gh-pages
Add new content to Ruby and Rails

* Ruby
Code Academy Ruby Course
Ruby Warrior
Code Wars

* Rails
Rails for zombies
Rails Anatomy
Introduction to Rails
Merge pull request #95 from vicmaster/add_ruby_and_rails_content

Add new content to Ruby and Rails
Rearranged ruby and fixed codecademy link
Added paypal support for sponsorship
Sponsorship actions
Fixed some faulty code before a commit
Added a minimum
Removed a bug that auto-fired sponsorship tier on click