Enable resizing of widgets within Graph Widget

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>
Fix vertex class name for resizing.

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