Issue: LIBCLOUD-477 Add list/delete/create network (VPC) calls within EC2
Merge pull request #2 from apache/trunk

Pulling in latest updates
Changed the return type to a list of EC2Network objects
Updated list/delete network tests
Merge pull request #3 from apache/trunk

Pulling in latest changes
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
Destroy -> Delete
Modify ex_delete_network method to take "vpc" as an argument.
Update CHANGES.
Add back a comment which was while resolving merge conflicts.