A mediator for passing messages around a SPA. Originally from https://github.com/rhysbrettbowen/PlastronJS/blob/master/mediator.js but dependancies changed to underscore for use with Backbone (and other) projects.
see: https://github.com/rhysbrettbowen/PlastronJS#mvcmediator for usage
##v1.0.0 -initial versioning