1.2.1
* The option 'onafter' is now called 'onAfter'.
* Two axis can be scrolled together, this is set with the option 'axis' ('x','y','xy','yx').
* In case 2 axes are chosen, the scrolling can be queued: one scrolls, and then the other.
* There's an intermediary event, 'onAfterFirst' called when axes are queued, after the first ends.
* If the option 'margin' is set to true, the plugin will take in account, the margin of the target(no use if target is a value).
* If the first axis to be scrolled, is already positioned, that animation will be skipped, to avoid a delay in the animation.