* CreateSecurityGroup now includes the group id in the reply, this
patch makes the code store this
* The patch also changes the delete call to use the group id if
present (since you must use the id when deleting VPC groups)
* Fix teh security group mock and test code to handle this new behavior
This patch makes it possible to specify GroupID in the options hash to the
aws computre requests operating on security groups. This is needed since
when working with VPC you must use GroupID instead of name.