Wheelygonzales

This updates the vendor folder to move from .tar.gz's to [wheels](http://pythonwheels.com), as well as updating many of the packages in there.

Pip, Virtualenv and Setuptools are all updated (virtualenv now uses wheels to pre-install a pip & setuptools in its newest version as well).

The dependencies can now be specified by specified rather than an exact file name.

The installation proceeds much faster thanks to binary unpacking of wheels. Coverage remained a .tar.gz because it has C to be built, so you would need a wheel for all platforms if you wanted to vendor wheels of it.

See [pip wheel](http://www.pip-installer.org/en/latest/usage.html#pip-wheel) for an easy way to update the wheels provided here.

Includes/supercedes #300 atm.