Addition of the following methods - update callback, add, delete, lock, unlock, isPlaying

Hi,
I have added the following because of methods because a project need. Please feel free to add any that you like.

update (callback) - pass through method for the window resize
add - add an array of new images 
del - delete an image
lock - lock any action on the gallery
unlock - remove lock
isPlaying - is the slide show playing

Thanks
Mark