Fixed a bug in multiple instantiation.

Fixed a bug which was coming if there are multiple instances.
BUG Details:
	Article element was getting removed from all the element groups except the first one
Exposed go function.

Exposed go function as goTo to change the slide manually.
Made some global variable as local variables

Made some global variable as local variables and add some semi colons
Merge pull request #1 from tak2cerlin/master

Fixed a bug in multiple instantiation.
Thanks tak2cerlin. If you are using it somewhere I'd love to see how you implemented it!