Update eventbus to 2.4.0.
Update eventbus to 2.4.0.

- https://github.com/greenrobot/EventBus/blob/master/CHANGELOG.md#v240-2014-11-11-clean-up-release

0359xiaodong/SeriesGuide,UweTrottmann/SeriesGuide,epiphany27/SeriesGuide,r00t-user/SeriesGuide,UweTrottmann/SeriesGuide,hoanganhx86/SeriesGuide,artemnikitin/SeriesGuide