xxx-EXPLORER ICONS (if not specified, source is "font-awesome")

 - MAIN TABS
	* Venues:		hospital-o
	* Customers:	users
	* Timeseries:	calendar
	* Pivot table:	cubes
	* Univariate:	square-o
	* Bivariate:	clone
	* Multivariate:	???
	* Completeness:	braille
	* About:		info-circle
 
 - SUB TABS
	* table:		table
	* barplot:		bar-chart
	* boxplot:		object-align-vertical (glyphicon)
	* heatmap:		equalizer (glyphicon)
	* scatterplot:	out_hsp_scp	
	* funnelplot:	space-shuttle
	* forestplot:	sort-by-attributes-alt (glyphicon)
	* lines:		line-chart
	* histogram:	area-chart
	* crosstab:		th-list
	* pyramid:		align-center
	* hotspots:		fire (glyphicon)
	* locations:	map-marker
	* choropleth:	globe