...now with custom mediator support

Adding the ability to define a new (optional) View property called
"globalEventBus", which allows one to utilize a custom
event-bus/mediator.

If the property is not defined, it defaults to the built-in Backbone
event-bus/mediator.
clean-up items

- replace the for-loop for _.each() to iterate over the events-array
- removing stray console.log statment
updating examples

- updating lib file in the exxamples dir
- adding new example to demonstrate the use of a custom mediator