stevenwanderski/bxslider-4 — pull request #639 by constantm (2014-09-21 14:26:00+00:00)
Title: Made onSlideBefore interruptible so sliding can be stopped.

When using bxSlider in a step by step interface, one might want to
validate the current slide before going on to the next. Using this you
can use the onSlideBefore callback to do validations and stop
transition if needed.