Rename HACKING to CONTRIBUTING.rst

Take advantage of [this GitHub feature](https://github.com/blog/1184-contributing-guidelines)
Upgrade pip and setuptools
Bump version
Merge branch '1.11.X'

Conflicts:
	docs/news.rst
Merge branch 'master' into develop

Conflicts:
	virtualenv.py
Move news to be a changelog
Move news to index.rst
Add intro, toctree, docs / links, contrast
Move development sections to this page
Installation instructions
Guide on virtualenv's major parts
Usage, options, config, extending
Remove all-in-one page
Allow virtualenv to build again! Yay!
Allow local use of rtd theme alla pip
Capitalization Is Awesome
Fix docs typos, thanks @alex
Move changelog entries to be 3rd level

So as not to cluster the TOC
Incorporate 6355f9b8 by @pfmoore
Refer to python instead of python3