Replace CoffeeScript logo with official version
Update README wrt CoffeeScript logo

The logo is no longer a recreation, but the official logo as provided
by @jashkenas.
Add alternative versions of CoffeeScript logo

Color, knockout, no-whitespace, color-no-whitespace, and
knockout-no-whitespace versions are included in this commit.
Changes CoffeeScript filenames, removes groups
Updates README to use production links to the SVGs
Merge branch 'pedromaltez-pm/patch/official_coffeescript_logo'
Properly lists @pedromaltez as a contributor
Add official Autoprefixer logos
Add Autoprefixer logos to test file
Add Autoprefixer knockout logo
Remove background:white from test file

This makes white/knockout logos visible on the test page
Rename Autoprefixer SVGs to `*-no-whitespace`

This is as per suggested in #2. Logos can have versions with whitespace
as well as without it.
Add Autoprefixer logos with whitespace

These conform to the pseudo-standard viewBox="0 0 121.7 81.3"
Replace `autoprefixer-*-no-whitespace` logos

These have been replaced with better versions, with separate path
tags for individual paths, which allows them to be targeted.
Update README with information on Autoprefixer

Including removal of request for Autoprefixer logo