Regenerate fonts with icomoon (fixes Android glitch)

Fonts generated by fontello result in missing glyphs in the stock Android browser (issue #7 ). This PR includes an updated font regenerated with [icomoon](http://icomoon.io) that fixes this issue.

I tried to regenerate the icon pack with fontello using different glyph codes. The Facebook icon reappears, but other glyphs are then absent:

![screen_shot_on_2014-12-21_at_12-52-56](https://cloud.githubusercontent.com/assets/647669/5519240/28ab309a-8942-11e4-8b57-a900c3ee8c39.jpg)

The fontello developer appears to be aware of the issue but doesn't believe it to be a problem with fontello: [#204](https://github.com/fontello/fontello/issues/204). I've tried deleting the woff file as suggested to force Android to fall back to the ttf, but the Facebook icon is still missing. I'm using Private Use Area encoding (most compatible). 

Using [icomoon](http://icomoon.io) to generate an icon font containing the same glyphs works in Android, iOS, and all desktop browsers tested (including IE 8-to-11).

![screen shot on 2014-12-21 at 18-30-26](https://cloud.githubusercontent.com/assets/647669/5519233/c58d6794-8941-11e4-8baf-906f9de6f6b8.png)

The `selection.json` file is included so that the kit can be added to using the in-browser [icomoon app](https://icomoon.io/app/).