[Pipeline] Show pipeline details for each chain

[jc7447]

In the main page of a pipeline manager, make chain name clickable.
On click, show pipeline details as XML with a graphical representation of the chain (http://stackoverflow.com/questions/7034/graph-visualization-library-in-javascript, http://www.graphdracula.net/)

• show pipeline
• show transition value

[jc7447]

• Propose a switch button to represent graph from left to right or up to down

http://visjs.org/examples/network/layout/hierarchicalLayout.html

[jc7447]

• Make node clickable : open a new browser tab to the component page

[troussej]

Try to get a neat ordering : for now there is a bit of back and forth, see ss.

[troussej]

• also : the "show xml" button should also toggle off the xml snippet.

[jc7447]

Node are now clickable, there is a toggle off button for xml and a switch button to change graph orientation.

This feature is still in beta for now, pipeline chain with lot of processors and without any fork are still not well readable.

I close this issue, we can continue to improve it though other task.