v1.3.0

• Add commands for shutter shutter_open, shutter_close, shutter_open?, shutter_close?

v1.2.0

• Add #busy? for Projector and take it into account when determining a power transition

v1.1.0

• Introduce interrogation methods for warming_up? and cooling_down?
• Introduce a any? method on Brodcaster
• power_on? becomes powered_on?
• power_off? becomes powered_off?

v1.0.0

Basic power functionality