new Large size for icons

Isn't it cool ? fix #140

Still need to adjust some vertical-adjustements in this particular menu context, but problem was yet here with the ex-LARGE size...

The new size for LARGE is almost good, just need to push up a little, I made a try with line-height, but it break some others things.



![capture decran 2013-10-02 a 01 41 53](https://f.cloud.github.com/assets/359847/1250266/89541906-2af3-11e3-8c57-9acc91fd1a44.png)
![capture decran 2013-10-02 a 01 43 07](https://f.cloud.github.com/assets/359847/1250267/8954cb76-2af3-11e3-89e4-707ee0e0f3c9.png)