Update checklist.html

- Some typos fixed
- Specific form control <input> replaced with "form controls"
- Explanation for aria-hidden corrected
Update README.md

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

Updated with new name and new links.
Merge pull request #58 from thomassjogren/patch-3

Update README.md
Merge pull request #60 from thomassjogren/patch-4

Update CONTRIBUTING.md
Update _layouts/default.html

It's big!
Merge pull request #61 from thomassjogren/patch-5

Update _layouts/default.html
Merge pull request #51 from backflip/gh-pages

Some minor fixes for checklist re: #42
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
Merge github.com:susanjrobertson/a11yproject.com into susanjrobertson-gh-pages
Adjusted Files from my build for hex color markers
Merge branch 'susanjrobertson-gh-pages' into gh-pages
Merge branch 'rvmrc' of github.com:jasonrhodes/simpleA11Y into jasonrhodes-rvmrc
Merge branch 'rvmrc' of github.com:jasonrhodes/simpleA11Y into gh-pages
Merge branch 'jasonrhodes-rvmrc' into gh-pages
Add reference to testing color contrast
update input name for color contrast
add for attributes to test section and make name and ID consistent in that section