Fixed font alias issue in Safari

In Safari (7.0.2 on Mavericks), clicking on one of the menu items causes the font in in the navbar to get thinner. By hard-setting the antialiasing method to `subpixel-antialiased` (Safari's default) this fixes that problem.

The problem:  
![](http://cl.ly/UCz6/problem.gif)

Fixed:  
![](http://cl.ly/UDng/fixed.gif)