Add edge bundling layer

[heshan0131]

Arcs and lines are important visual primitives to encode origin-destination visualizations. However, when data gets too large, these visualizations can become unreadable, hiding away underlying patterns. Edge-bundling has been used to reduce visual clutter. To enhance the arc and line layer, we will use the Multilevel Agglomerative Edge Bundling method presented in this paper. Based on the javascript implementation in mingle.

• Add an edge bundling layer to bundle lines together

• Add curve and delta slider to control bundle results