2.0.0: kerning on/off, WOFF 2.0, various fixes

- [new] Serve WOFF 2.0 format to very modern browsers
- [new] Setting to load fonts without kerning tables:
```scss
/**
 * Kerning
 *
 * - on: larger file, better rendering
 * - off: smaller files
 *
 *  @type String
 */
$guss-webfonts-kerning: 'on' !default;
```
- [fix] SVG fonts work in older browsers
- [fix] `Guardian Weekend Condensed Web` renamed to `Guardian Weekend Cond Web`
to match the internal name character length limit

New directory structure looks like this:

![screen shot 2014-08-04 at 12 01 31](https://cloud.githubusercontent.com/assets/85783/3796297/bf754b6c-1bc6-11e4-9aed-518e7eb00075.PNG)

/cc @paperboyo @phamann 

![ ](http://gifs.joelglovier.com/upset/whyyyyy.gif)