add method getButton()
change property from 'enabled' to 'is_enabled'
add alias to state names
add property 'is_active'
add getters 'background' and 'label'
handle if label is nil
Merge branch 'master' of github.com:dmccuskey/DMC-Corona-Widgets into popover-0.x
Merge branch 'popover-0.x' of github.com:dmccuskey/DMC-Corona-Widgets into popover-0.x