Update README.md

Third time... Should be good now.
Update CONTRIBUTING.md

Updated with new name and new links.
Update _layouts/default.html

It's big!
post on alt text as discussed in issue #63
revisions to text at the comments of grayghostvisuals
Guarantee correct Ruby/Jekyll compatibility, for RVM users
Adjusted Files from my build for hex color markers
update input name for color contrast
add for attributes to test section and make name and ID consistent in that section