Add "media" type catalog item information retrieval and management
Add knife commands to use vcloud-rest API call to discard suspended state

Official documentation:
http://pubs.vmware.com/vcd-55/topic/com.vmware.vcloud.api.reference.doc_55/doc/operations/POST-DiscardVAppState.html
Adapt 'vc vm show' to display different IPs from same network
Update CHANGELOG
Updated README