Remove `-moz-background-clip`

 The `background-clip` property has been unprefixed since Firefox 3.6:
    - http://caniuse.com/background-img-opts
    - https://developer.mozilla.org/en-US/docs/CSS/background-clip

 Thanks @Mottie for noticing
Minor improvements

 * add `IE 10+` to `animation`, `transform` and `transition`:
   http://blogs.msdn.com/b/ie/archive/2012/06/06/moving-the-stable-web-forward-in-ie10-release-preview.aspx
 * arrange browsers names alphabetically
 * correct indentation
 * improve consistency
Merge pull request #114 from alrra/improvements

Minor improvements