Added "vapp_scoped_local_id" to vms_hash in get_vapp
Moved default to false for fenced deployments, added parent network specification to set_vapp_network_config
Added new methods
- compose_vapp_from_vm : compose a vapp using VMs in a catalog
- get_vapp_template : get information on VMs inside a vapp template
- set_vapp_port_forwarding_rules : set nat port forwarding rules in an existing vapp

fixed test suite
added example and modified README
Merge pull request #9 from frapposelli/develop

Added new methods and slightly modified some default behaviors