Add Alert modules
Alert Message from server #71

Messages are now global with their own module
and entities.
backbone.sef.js trigger 'show:alert') and the alert module catches it
and displays an error.
We can also trigger success messages with
App.vent.trigger('show:success'); This process needs to be more
customize-able.
Merge pull request #112 from synergy55inc/global-alert

Global alert for issue #71