Sorted references by title in lexical order.
References added for PyCon US, Autism Speaks, American Cancer Society and the Epilepsy Foundation.
Editing on "How far out has Python spread in the universe"
Edited the content without the intention of altering the meaning. Added references to the Twisted project and the quote from NASA Goddard.
Minor spelling and grammar changes.
Correct forebearing to forbearing.
Remove inappropriate use of commas.
Trivial spelling correction.