New generic webfont icon

Updates the EWF style file to use the new brand-neutral icon:

![icon](http://f.cl.ly/items/081T1W3y2k3T0O2L473d/Screen%20Shot%202013-04-27%20at%204.34.23%20PM.png "icon")

Addresses #91.

CC @larz0 @ryanstewart