Add Foundation Icon Fonts 3

Closes #30

Add [Foundation Icon Fonts 3](http://zurb.com/playground/foundation-icon-fonts-3) to GlyphSearch.

Re-used the old crawler I had done for Octicons([octicons-glyphsearch-crawler](https://github.com/matiassingers/octicons-glyphsearch-crawler)), should again make it easier to keep the data up-to-date. [foundation-icon-fonts-3-glyphsearch-crawler](https://github.com/matiassingers/foundation-icon-fonts-3-glyphsearch-crawler)

Let me know if there is any problems. 

Just need the `grunt index` from @thomaspark :smile: