The font card titlebar now needs the font family passed in.
<ddt-font-card-add> now has no titlebar.
Added a file picker service.

The file picker button now uses this service to pop up the file
picker dialog.
The fontCollection service no longer broadcasts any events.
FontFamily objects now keep track of how font files are loaded.
Added the file picker to index.js.
Moved grouping logic out of the controller and into the template.
Some changes to the word font card.

    * Moved the titlebar into the font card.
    * Added the ability to add a new font to the font family.
Imported the Less file for the word font card.
Removed the font card titlebar directive.
Moved the file picker service into a directory, with its own LESS.
Updated the README.
Import LESS files.
Remove imports that no longer exist.
Remove imports that no longer exist.