Progress on setting the node radius to the size of the sum of its edge.size attributes.

* Added the function setNodeSize(node){} for var node.attr("r") to use. (line 51)

* Working on finding the nodes edges in the link array, finding their size, then summing that and returning it.
Implemented node size set by the sum of the size attribute of its edges.

* The edges, or links, represent a packet. So, they have a size attribute representing the packet size.

* The helper function setNodeSize(node) is called for var node in the visualizeIt() function.

* setNodeSize(node) takes in a node, gets the its index in context of the nodes array, and finds all edges that correspond to it.
	* It has a min of size 8 and a max of size 75, and in between these it scales down the size using Math.sqrt before returning it.

* Working on changing color next, have made minor changes in this area.