show the tree in circular format instead of top down

[niryariv]

we want the network to look like a "solar system" rather than a tree. in order to achieve this, instead of using a top->bottom we'll display the nodes as a circle. Here's an example:

note that the big circles are the top children (ie the sons of the core node). the circles that connect everything together (give it the "solar system" look) are mostly there for design reasons, we can handle them later on.

[ceoaliongroo]

Example code:
http://bl.ocks.org/mbostock/4063550

[ceoaliongroo]

WIP:

[ceoaliongroo]

Update:

[ceoaliongroo]

Update:

[ceoaliongroo]

Update:

[amitaibu]

Closing in favor of smaller issues.