Quote cmd_ as Sphinx thinks that is a reference
No need to keep __main__

Once a setuptools console script is in place, there's no need to
keep the __main__ entry point.
Remove link no longer used
Add links to online documentation

Docs are hosted at ReadTheDocs.
Add CHANGES.rst to documentation
Standarize documentation headers

Use the double header for first level titles, i.e.:

=====
title
=====

As a second level only underline with equal signs, i.e.:

title
=====

And further levels starting with dashes and asterisks, i.e.:

title
-----

section
*******
Capitalize at the beginning and end with a dot.
No need to getattr the arguments
Request path can contain < and > symbols
PEP8: line too long
Typo
Format typo