code: public static SwipeBack attach(Activity activity, Type type) {
  		return attach(activity, type, Position.START);
  	}
docs: Attaches the SwipeBack to the Activity.
  
  @param activity
  The activity the Swipe Back will be attached to.
  @param type
  The {@link SwipeBack.Type} of the drawer.
  @return The created SwipeBack instance.