Issue: LIBCLOUD-477 Add list/delete/create network (VPC) calls within EC2
Changed the return type to a list of EC2Network objects
Updated list/delete network tests
Merge branch 'LIBCLOUD-467_Add_VPC_Lifecycle_Support' into trunk

Conflicts:
	libcloud/compute/drivers/ec2.py
	libcloud/test/compute/test_ec2.py
Updated ex_create_network to return an EC2Network object
Updated test_ex_create_network accordingly
Merge pull request #5 from DivvyCloud/LIBCLOUD-467_Add_VPC_Lifecycle_Support

Libcloud 467 add vpc lifecycle support