Initial commit with basic font browsing / filtering

A working initial version of the font browser.

Major features still missing:
 - Search filter
 - Ability to specify if filters are AND or OR
 - UI to select fonts and generate JS include code
 - UI to select only some font variations, if we get there
 - Display of current font being used for the general page with ability
to change it
 - Dynamic height (updated on resize) for font browser box