d3.js graph visualization, improve available code

This task requires d3.js graph visualization library experience. Given pulic available graph located by [login to view URL] and json dataset located on [login to view URL] create two modifications. 1) Public graph features + directed arrows visualized. From Source to Target Node. 2) Public graph all features and add features such as: a) remove central gravity, Node size depends from number of node connections. b) display Nodes company names c) Get each edge value from json and plot text with Values parallel to edge. d) make each node dragable and pulling other node.