Now working with all IE version, and permits IE @media queries hack

* The script is now working with IE7 as well.

* IE function to check the IE version is now accessible for all others fonctions. 

* The script makes sure that the media queries hack for IE6/IE7/IE8 will not be ignored, unlike the standard media queries. 
* Each IE media query hack now works only with its respective version of IE. 

* The concerned media queries are: 

``@media \0screen\,screen\9`` for IE6,IE7,IE8
``@media \0screen`` for IE8
``@media screen\9`` for IE6,IE7
``@media screen\0`` for IE8,IE9,IE10

These hacks can be found at http://browserhacks.com/

* Also, I Had to change the way @media queries were removed, since it made conflict when using other types of queries (such as @keyframe). Since the script was looking for two `` } } `` to delete everything between it and the @media query, it was making an error, deleting a whole batch of CSS code when the `` } } `` were in fact closing something else than a @media, like @keyframe