Use connect-fonts to serve up browser/locale specific fonts to reduce overall download size.

This is try number two, using the new connect-fonts.

1) An update to connect-cachify is needed so that resources that are not in the root path can be looked up in a table - mozilla/connect-cachify#27
2) core font functionality is in connect-fonts which could use some review.
3) fonts are located in connect-fonts-opensans. Fonts for several Euro-centric locales have been added.

This should help significantly reduce the font footprint for the majority of our users as well as remove the fonts from the repo itself.