pySphere 0.2.0

• Forked from Google Code to GitHub by Shao-Chung Chen
• Added VIDatastore class to manage files/folders on datastores
• Added vms_from_folder(), get_datastore_by_name() methods to VIServer
• Added get_directory(), create_screenshot(), get_screenshot() methods to VIVirtualMachine
• Added interactive session option to VIVirtualMachine.login_in_guest()
• Added synchronous run option to VIVirtualMachine.start_process()