code: public static boolean register(final IEventHandler who) {
          final Handle handle = Handle.getInstance();
          final boolean result = handle._register(who);
          if (result) {
              handle._deliverStickies(who);
          }
          return result;
      }
docs: Registers {@link IEventHandler} with this bus.
  The best place to register for objects with lyfecycle is {@link Activity#onStart()} and {@link Fragment#onStart()}
  @param who {@link IEventHandler} to handle events
  @return true if {@link IEventHandler} was registered
  false if {@link IEventHandler} was already registered