0.6: add multi monitor mode

• #9

0.5: hotkey support for menu popup

• hotkey support for menu popup

0.4: show virtual space id

• hide raw space id, show virtual one (which goes in order and coincides with the desktop number in mission control)

0.3: add hotkey to show set-space name dialog

• show version into the main menu
• show current value in set-space dialog
• add cancel button into set-space dialog