Change hash-bang for maximum compatability

This is to fix https://github.com/kivy/python-for-android/issues/88
The ideal solution, according to Python PEP 0394, would seem to be 
'#!/usr/bin/env python2', however that PEP is unfortunately not 
well-followed by OSX and even Linux distros like Arch and Debian 
Squeeze. Because of this, and because Kivy currently only supports 
Python2.7, the more practical solution is '#!/usr/bin/env python2.7'.
Merge pull request #89 from brousch/patch-1

Change hash-bang for maximum compatability
docs/source/usage: link to recipes for full listing

It is not immediately obvious to the new user to look up recipes, so
link to it after the example.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
docs/source/recipes: update available list

Update the list of recipes from recipes/ in the source directory.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>