0.9.4 (25-Oct-2013):
* add 'vdi-compose' and 'vdi-similar-content' subcommands
* add mirror manipulation subcommands

0.9.3 (8-Jul-2013):
* add 'vdi-resize' subcommand

0.9.2 (6-Jul-2013):
* add 'sr-stat' subcommand

0.9.1 (30-Jun-2013):
* add the ability to upload device_config parameters by providing a filename

0.9.0 (30-May-2013):
* first public release

