Option: advance to next slide on click

[stakes]

Added an option advanceOnClick which, when set to true, will advance to the next slide if the user clicks anywhere on the image. This behavior is useful if you're using Orbit for a linear progression of images like a feature tour.

Clicking on the caption won't advance the slide and if the image itself is wrapped in an tag (as in the demo.html) it should still behave as a normal link.

[pboling]

This is awesome