fix(SlideDrag) clears drag when list is scrolled or new drag starts

This also fixes the broken $ionicListDelegate.clearOptionButtons() method.

Makes lists feel more natural inline with iOS functionality and fixes issues
with using ion-option-buttons with collection repeat
Merge branch 'collection-repeat-no-redraw' into mallzee
Merge branch 'slide-drag-clear' into mallzee
Merge branch 'slidebox-disable-drag' into mallzee
Updating mallzee release