HUE-1797 [beeswax] Integrate new graph lib and multi columns

Changed jHueBlueprint to the new NVD3 and HueCharts bindings on Beeswax/Impala
Added new leaflet map binding to charts
HUE-2253 [fb] Simpler bottom bar

Added a condition to disable the 'first' and 'previous' buttons if there are no items in the directory.