More Diagramming in Markdown support #200

Would be great to have more diagramming tools e.g:

1) Dataflows:

• dataflow - unfortunately in Haskell, but maybe there is a way to integrate with it, or possibly there something similar in JS, perhaps this one:
• flowchart.js
• (I realize Mermaid can do some of this)

2) UI mockups (Wireframes):

• Plantuml salt (wireframes seems a bit dated)

• Markdown-UI

• other ideas

• would it make sense to embed html like this?

  • wired.js
  • Wireframe-CSS

• wondering if it would be useful to integrate with something like balsamiq ?

3) Network and other diagrams:

• vis.js
• viz.js
• cytoscape