Fixes #6591/BZ1076364: include fonts that datepicker depends on.

Angular UI's datepicker is dependent on some bootstrap 3 fonts
that we were not including.  This commit includes these fonts
so the datepicker's arrows are displayed correctly.

http://projects.theforeman.org/issues/6591
https://bugzilla.redhat.com/show_bug.cgi?id=1076364