Initial commit for the w3validator plugin

Add initial files and plugin description,
Modify the way something is spelled in WoW/README.

The current product, as is, will not yet fully work.
Rename w3_colour_validity; fix missing 'self'

Renames all instances of 'validity' to 'status'
Add the 'self' parameter to w3_colour_status.
bugfixes, alterations, and optimisations.

Fixes a NoneType check error by calling w3_validate_url directly,
Reduce overhead and redundant code,
Include the amount of warnings and errors in a valid document if any,
Correctly capitalise an aborted document for consistency,
Add colours where it feels needed,
Serveral grammar fixes.
Make it flake8 compatible.

Perhaps I should start coding from an IDE sometime.
Adds a newline at the end of the file.
Merge pull request #12 from Zarthus/w3-val

W3.org validator plugin, validate your websites with Ultros from irc!