[TASK] Update OpenSans font, add WOFF2, remove SVG

The updated font should render special foreign characters (such as ä).
SVG fonts are deprecated, according to caniuse.com.
Upload generator_config.txt to FontSquirrel to see which settings were used.

- Before:
![before](https://cloud.githubusercontent.com/assets/6348321/5559409/6a354dee-8d4c-11e4-80b0-fbe5fdd7881e.jpg)

- After:
![after](https://cloud.githubusercontent.com/assets/6348321/5559417/84b5982c-8d4c-11e4-87fb-b71be1963a50.jpg)

@rippletravis