fixed broken rotateIn* in Chrome & IE10 by switching to grunt-contrib-cssmin (clean-css)

Sorry, I didn't test the initial 3.0.0 changes very well. Seems the only place the `animate.min.css` works fully is Win-Firefox, not IE10, Chrome Beta, nor Android-Note2.

The `animate.css` works fine, but [animate.min.css is broken](http://codepen.io/tomByrer/pen/icHmj) for all the [rotating entrances](https://github.com/daneden/animate.css/tree/master/source/rotating_entrances).  `grunt-csso` wants to add extra `0%` in the wrong places.

[cssmin](https://github.com/gruntjs/grunt-contrib-cssmin) causes no errors so far, though the file is slightly larger.  Fixed here: http://codepen.io/tomByrer/full/Jbmxd
Could this please be **immediately** fully tested in iOS & OSX devices, then pushed to master & CDN to fix the broken min file?  Improvements can come later.

As an added bonus, I added a top-comment for essential ID.

@RadLikeWhoa, I could not get the templating to work the [comment](https://github.com/tomByrer/animate.css/blob/master/Gruntfile.js#L33); suggestions please?