Namespace all mapael events

[Indigo744]

It is good practice to use namespaced events in order to avoid name collision and such.
This will also allow to easily unbind all mapael events if we need to.

Further reading: http://www.learningjquery.com/2007/09/namespace-your-events

[neveldo]

You are right, it's a great improvement, thank you for making a PR !