Added a Cellular Automata section (As I don't feel it fits into any of the other sections) and added a master link to a collection of ebooks about Cellular Automata. I'll be sorting through these shortly.

free-programming-books.md

@@ -201,6 +201,9 @@
 * [Mathematical Logic - an Introduction](http://www.ii.uib.no/~michal/und/i227/book/book.pdf) (PDF)
 * [Bayesian Methods for Hackers](https://github.com/CamDavidsonPilon/Probabilistic-Programming-and-Bayesian-Methods-for-Hackers)
 
+####Cellular Automata
+* [Cellular Automata Books](http://uncomp.uwe.ac.uk/genaro/Cellular_Automata_Repository/Books.html)
+
 ####Misc
 * [97 Things Every Programmer Should Know](http://programmer.97things.oreilly.com/)
 * [97 Things Every Programmer Should Know - Extended](https://leanpub.com/97-Things-Every-Programmer-Should-Know-Extended)