Added link to "Reinforcement Learning: An Introduction" by Sutton & Barto
Add link to How To Think Like a Computer Scientist *Interactive edition*

There's a free and pretty great interactive edition of HTLCS. Code samples can be edited and executed in the browser. Some code samples can even be stepped through. Add link to this.
adding ruby to the index
removed code bright and code happy (not free)
Merge pull request #225 from roland-ewald/patch-1

Added link to "Reinforcement Learning: An Introduction" by Sutton & Bart...
Merge pull request #226 from johand/fix

adding ruby to the index
Merge pull request #227 from hangtwenty/patch-1

Add link to How To Think Like a Computer Scientist *Interactive edition*
Merge pull request #228 from borgified/master

removed code bright and code happy (not free)