Merge pull request #257 from amitdev/patch-1

Added a book on parallel programming

free-programming-books.md

@@ -222,6 +222,7 @@
 * [High Performance Computing](http://cnx.org/content/col11136/latest) (PDF, ePUB) - Charles Severance & Kevin Dowd
 * [Is Parallel Programming Hard, And, If So, What Can You Do About It?](http://kernel.org/pub/linux/kernel/people/paulmck/perfbook/perfbook.html)
 * [Introduction to Parallel Computing](https://computing.llnl.gov/tutorials/parallel_comp/) - Blaise Barney
+* [Programming on Parallel Machines; GPU, Multicore, Clusters and More] (http://heather.cs.ucdavis.edu/parprocbook) - Norm Matloff
 
 ####Software Architecture
 * [Seamless Object-Oriented Software Architecture](http://www.bon-method.com/book_print_a4.pdf) (PDF)