Add BaseClass

[paulfalgout]

Should have the listenTo, replyTo, complyTo functionality.

See #4

[paulfalgout]

listenTo is part of Backbone.Events Consider radioEvents radioRequests radioCommands

[paulfalgout]

This is going to be resolved shortly likely for 2.5 marionettejs/backbone.marionette#2431

[paulfalgout]

We should just adopt this https://github.com/benmccormick/marionette-service as an alternative for those who don't have first class support from what is soon to be built into Mn.