Merge pull request #941 from marios-zindilis/master

Added OpenStack Operations Guide

free-programming-books.md

@@ -255,6 +255,7 @@
 
 ####Cloud Computing
 * [Multi-tenant Applications for the Cloud, 3rd Edition](http://www.microsoft.com/en-us/download/details.aspx?id=29263)
+* [OpenStack Operations Guide](http://docs.openstack.org/ops/)
 
 
 ####Compiler Design