allow top ribbons be position:fixed too

just add the "fixed" class to your wrapper and the ribbon will be fixed
(or static) in the corner, not scrolling away.

Fixes: #11
set the style of a:hover explicitely

if not set, the ribbon will inherit the hover style from (e.g., if used)
twitter bootstrap and become funny blue-ish and not as we want it.
Merge pull request #16 from evgeni/explicit-styles

set the style of a:hover explicitely
Merge pull request #15 from evgeni/fixed-top-ribbon

allow top ribbons be position:fixed too
set z-index on the ribbon wrapper too

when using a fixed ribbon and a fixed bootstrap navbar, the ribbon is below
the navbar, despite having z-index:9999. setting the z-index on the wrapper
fixes this issue.
Merge pull request #17 from evgeni/bootstrap-zindex

set z-index on the ribbon wrapper too
Made .github-fork-ribbon-wrapper to pass through mouse/touch events
Merge pull request #19 from shyiko/master

Made .github-fork-ribbon-wrapper to pass through mouse/touch events
Add MIT License
Merge branch 'master' of github.com:simonwhitaker/github-fork-ribbon-css
index.html: switch to HTML5.
README.md: use the new GitHub pages io URL.
Update gh-fork-ribbon.css.

* add missing fallback border-color
* remove unit from 0 and change `0.00` to `0`
* add missing vendor prefixed properties
* use the shorthand font property
* fix typo in comment
* use the hex colors consistently
* remove comments for self-explanatory code
index.html: minor cleanup in the inline CSS.
Fix IE 9 issue.

Move `filter` property to gh-fork-ribbon.ie.css and include the css if less than IE 9.

Also make sure we use the latest IE version by setting the `X-UA-Compatible` property.