Adding documentation to README

Cleaned up the table

Small changes

Remove CSS

Put width back in for row names

Remove unneeded HTML

Testing inline colors

Tag oops

Colors don't work
Add title for feature grid
Accidentally a pound
Move "what is the polyfill" and expand on build target descriptions
Remove build instructions and title
Merge pull request #239 from rjwright/Docs

Add more information to the readme
Move feedback sections of the documentation to the bottom
Merge pull request #240 from rjwright/DocsChanges

Move feedback sections of the documentation to the bottom
Merge remote-tracking branch 'web-animations-next/master' into HEAD