feat (directive): IE9 Support

IE9 support, so the carrousel will work on IE9.
Optional parameter rn-carousel-ie9support will enable this support.
If enabled, the directive will check if the browser is IE9
and, in this case, will use translate instead of translate3d.
For this to work, a RequestAnimationFrame polyfill is needed. You can
install any of your convenience, e.g. 'bower install raf.js'

Version tag: 0.2.0+IE9Support
Merge branch 'master' of https://github.com/intelligenia/angular-carousel