Exposed reference to the 'shapeContainer' object

[thingsinjars]

The shapes in the shape plugin are all added to the internal 'shapeContainer' object. It'd be handy to either:

• have an easy access to this container or
• pass in a container to be used instead

Otherwise you have to root around inside the 'originalMap' call to grab hold of it.

[johnkattenhorn]

It's second that, I was wondering if you could share your code for obtaining the internal one as I'd like to build out a zoom to marker function.