added Fluent Python to the learning page.

Author: PythonCHB

source/references/learning.rst

@@ -109,6 +109,8 @@ Advanced Books
   (http://chimera.labs.oreilly.com/books/1230000000393):
   The Python Cookbook provides practical solutions to various programming tasks, along with excellent explanations of how they work. Written by David Beazley -- Python author and instructor extraordinaire. Also available fully online: (http://chimera.labs.oreilly.com/books/1230000000393/index.html)
 
+* **Fluent Python**
+  (http://shop.oreilly.com/product/0636920032519.do): Fluent Python is an excellent deeper dive into the inner workings of   Python. Written for folks that already understand the basics of Python, it goes provides explainations of the more advanced topics in Python. If we were going to use a textbook for an advanced Python class, this would be it. 
 
 Evaluating Your Options
 -----------------------------