Improvements to visualization tool

[tiagofilipe12]

Currently bionode-watermill has a visualization tool available when running your scripts in localhost:8084. This visualization tool is basically a d3 force-directed graph that enables to draw vertices and edges from an object like this:

{
  "graph": {
    "mode": "NORMAL",
    "vertices": [
      //...Array of vertices
    ],
    "edges": [
      //...Array of edges
    ] 
  }
}

It would be nice to improve this tool by:

• Adding arrows in different colors representing the input and output flow. Currently, it just represents the flow between tasks (mediated by orchestrators) with black arrows.
• It would be also cool to make a way to know in green what have run already (successfully), yellow what is pending, red what has failed and in blue what was not yet ran.