Added the set_machine method.
Added changes for 0.3.0.
Updated readme for 0.3.0.
Updated manifest for 0.3.0.
Added another change for 0.3.0.
Remove doc directory and file.
Added development dependencies.
Updated gem:create task, plus another changes update.
Added a known issue to the readme.
Added some documentation to the trigger= method.
Added some validation trigger= and new_work_item trigger arguments.