HUE-2410 [core] Upgrade to font-awesome 4.2

Updated fonts and css for 4.2 upgrade of font-awesome
[HUE-2411] limit fetching autocomplete users and groups to 2000

This works around a bug in the frontend that fetches and caches the
users and groups for autocomplete text input areas. Eventually this
should be replaced with a query to the backend.
HUE-2414 [search] Timeline chart breaks when there's no extraSeries defined

Fixed KO js error
HUE-2347 [fb] Drag and drop to move files

Added ability to move items by dragging and dropping them on directories
Fixed a JS error on IE9
Merge remote-tracking branch 'remotes/origin/HUE-2347-fbDragNdropMove-paul' into HUE-2347-fbDragNdropMove-paul