Add white FontAwesome files for Alfred dark theme interfaces.
When using Alfred's "Dark Theme" the black FontAwesome icons don't show up against the background until selected. Displaying the white icons based on background color or even an argument would help out a lot.

![image](https://f.cloud.github.com/assets/1154273/1208977/dd6aebce-25de-11e3-9e79-12ec53bfc824.png)

Reported by @shawnphoffman on https://github.com/zenorocha/alfred-workflows/issues/15
