Fix alias tag error and add tags to body

Fix the error with the alias tag and add alias and except_alias to body payload

Multiple device registration

Pushbots::Devices.new

Device management support

Pushbots::Device.new
Pushbots::Device.delete
Pushbots::Device.register
Pushbots::Device.info

Single and Multiple device notification support

Pushbots::One.new
Pushbots::All.new