Correct mistakes/omissions in the README.

The README says the license files are Markdown but they are not.
The text of the license should be wrapped to a 78 character width.
README.md: Break long lines.
README.md: no need to make the localhost a clickable link.
Merge pull request #160 from XhmikosR/readme

Readme
Specify box sizing.
Clean up unused class and inherited properties.
Use qTip from the first mirror instead of the cloudflare distribution.
Work around issues with old IE.
Remove selectivizr-min.js.

It's not needed anymore as things work pretty good with old browsers.