code: void connect( SquareNode a , int indexA , SquareNode b , int indexB , double distance ) {
  		SquareEdge edge = edgeManager.requestInstance();
  		edge.reset();
  
  		edge.a = a;
  		edge.sideA = indexA;
  		edge.b = b;
  		edge.sideB = indexB;
  		edge.distance = distance;
  
  		a.edges[indexA] = edge;
  		b.edges[indexB] = edge;
  	}
docs: Creates a new edge which will connect the two nodes.  The side on each node which is connected
  is specified by the indexes.
  @param a First node
  @param indexA side on node 'a'
  @param b Second node
  @param indexB side on node 'b'
  @param distance distance apart the center of the two nodes