Support for WOFF2

Google Chrome 36 comes with WOFF 2.0 support.

Compare the file size by web font format:

> WOFF: 2.292 Byte
> WOFF2: 1.572 Byte

The _woff2_ file was created with a small command line tool: https://gist.github.com/sergejmueller/cf6b4f2133bcb3e2f64a