Add basic information about C extensions
Add subsection about advantages of wheels
Add link to pull-requests on github.
Add Other Resources section

Link to the Python Packaging User Guide, with caveat that it is a work
in progress.
Add link to PyPI Pins wheel pin in Other Resources
Merge branch 'master' into wheel_docs

Conflicts:
	index.html
Move link to PPUG into "What is this list?"
Add links to distuils-sig and packaging-problems
Merge pull request #33 from Ian-Foote/wheel_docs

Improve documentation