Try different HTML canvas framework to render the node graph

Potential JS lib

• SigmaJS (Done)
• Arborjs (Not start)
• spriny (Not start) (https://github.com/dhotson/springy)
• ThreeJS (Not start) (http://monkeyswithspoons.com/2012/09/protect-connected-node-graph-html5-canvas/, https://github.com/davidpiegza/Graph-Visualization/)

#The Demo should prove below functions: (Refer to the behaviour in ETR)

1. Force Directed Layout Supported (http://webatlas.fr/tempshare/ForceAtlas2_Paper.pdf)
2. Initially loading one root node and 20 related nodes(root node and 1st level sub nodes)
3. Click one node will drill down for the selected node(another 20 nodes in 2nd level) and hide the nodes in 1st level
4. Node style can be customized(embed a image)