Merge pull request #4 from Arasthel/develop

Added OnSlideClickListener so clicking on slides will trigger a callback
Fixes #2
Merge branch 'develop' of https://github.com/marvinlabs/android-slideshow-widget into develop
Inline documentation & formatting
Add methods to listen to slide show events
Fix onSlideShown notification timing
Add some feedback to event listeners in demo (toast on slide click and debug log for slide events)
Add Random playlist
Prepare 0.2.0
Merge remote-tracking branch 'upstream/develop' into develop