Add book - Writing Idiomatic Python

docs/intro/learning.rst

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 Python 3 and 2.6 versions.
 
     `Python Pocket Reference <http://shop.oreilly.com/product/9780596158095.do>`_
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+Writing Idiomatic Python 2.7.3
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+"Writing Idiomatic Python", written by Jeff Knupp, contains the most common and important Python idioms in a format that maximizes identification and understanding. Each idiom is presented as a recommendation to write some commonly used piece of code. It is followed by an explanation of why the idiom is important. It also contains two code samples: the "Harmful" way to write it and the "Idiomatic" way
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