New features

[gentoo90]

I saw NOT LONGER MAINTAINING notice, but I'll live this here anyway to let people know. I added these features in 2014 for my own needs, and I don't use VSphere now either.

• Able to login using OS session credentials on both Windows (SSPI) and Linux (MIT Kerberos), #17

from pysphere import VIServer
server = VIServer()
server.connect("esxi.domain.local", passthrough=True)

• Able to rename VM snapshots (rename_current_snapshot, rename_named_snapshot, rename_snapshot_by_path methods of VIVirtualMachine) (#56)
• Able to register and unregister VM (add/remove existing vmx to inventory)
• VIFileManager, manipulates files on datastores (list files, create folder, upload, download, move, copy, delete)
• Added _create_filter, _wait_for_updates methods to VIServer
• VIVirtualMachine.list_processes() can filter processes by PIDs.