Added SICP in Python (#2159)

* Added SICP in Python

* deleted two spaces

* fix ordering

free-programming-books.md

@@ -1825,6 +1825,7 @@ For resources on Angular, Backbone, D3, Dojo, Ember, Express, jQuery, Knockout,
 * [Python Programming](https://upload.wikimedia.org/wikipedia/commons/9/91/Python_Programming.pdf) (PDF) (2.6)
 * [Python Scientific Lecture Notes](http://scipy-lectures.github.io)
 * [Python Standard Library](http://effbot.org/librarybook/) - Fredrik Lundh
+* [SICP in Python](http://www-inst.eecs.berkeley.edu/~cs61a/sp12/book/) (3.2)
 * [Snake Wrangling For Kids](http://www.briggs.net.nz/snake-wrangling-for-kids.html) (3.x)
 * [Test-Driven Web Development with Python](http://chimera.labs.oreilly.com/books/1234000000754/index.html) (3.3 - 3.x)
 * [Text Processing in Python](http://gnosis.cx/TPiP/) - David Mertz (2.3 - 2.x)