Bug 972871 - [Calendar] Create custom font with vector icons used by 1.4 visual refresh r=gaye

add custom font with 4 icons.

the SVG font is kept in the repository just in case we need to recreate the font using [IcoMoon](http://icomoon.io/app/) or any other software. - we only use the WOFF file

screenshot of the icons at "font-size:32px" (100%):

![screen shot 2014-02-14 at 15 33 12](https://f.cloud.github.com/assets/155633/2173223/5b0d26f8-959e-11e3-85ae-9cb03ea22bd1.png)