normalize.min.css: Put back the license header.

It was accidentally removed.
Merge pull request #147 from XhmikosR/patch-1

normalize.min.css: Put back the license header.
Update application.css.

Clean up fonts; here's no need to specify all of them in each selector; they are inherited.
Get rid of unicode symbol from selector's name.
Rename clearfix class.
Get rid of useless `!important` declarations.

The custom qTip selectors are after qTip.css so there's no need to use `!important`.
Group common properties together.