Circle Layout should take vertex size into consideration.

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Demo/Test Page(s)

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Add CirclePacking Demo

Signed-off-by: Gordon Smith <gordonjsmith@gmail.com>
Add Graph Test Page

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>