new visualization: edge bundling

Courtesy of Betsy McPhail
Merge remote-tracking branch 'origin/edgebundling' into interactiveHeatMapAndScatterPlotMatrix

Conflicts:
	Gruntfile.js
	app/src/views/VisualizationManagementView.js
Added ability to select one or more scatterplots from the matrix and "drill-down" to a larger view.