Merge pull request #1196 from thrabchak/master

Add "CS For All"

free-programming-books.md

@@ -387,6 +387,7 @@
 * [Come, Let's Play: Scenario-Based Programming Using Live Sequence Charts](http://www.scribd.com/doc/175241338/Come-Let-s-Play)
 * [Communicating Sequential Processes](http://www.usingcsp.com/cspbook.pdf) (PDF) by Tony Hoare
 * [Computer Musings](http://scpd.stanford.edu/knuth/index.jsp) (lectures by Donald Knuth)
+* [CS For All](http://www.cs.hmc.edu/csforall/)
 * [Culture \& Empire: Digital Revolution](http://hintjens.com/books) (PDF)
 * [Data-Intensive Text Processing with MapReduce](http://www.umiacs.umd.edu/~jimmylin/MapReduce-book-final.pdf) (PDF)
 * [Designing Interfaces](http://designinginterfaces.com) by Jennifer Tidwell