IN PROGRESS - issue CORE-4191: Implement WYSIWYG toolbar 
https://pods.iplantcollaborative.org/jira/browse/CORE-4191

Added an app integration toolbar. Refactored some of the services,
moving some of their definitions into service interfaces and added some
deferred binding commands so they could be "GWT.created". Hooray ISP.
Preview UI still needs to be implemented, as does preview json and
argument order. Preview JSON is tasked into CORE-4215, and ArgumentOrder
is tasked into CORE-4192.
Deletion still needs to be implemented, but this will require a
selection eventing mechanism be implemented in AppTemplateWizard (and
its subclasses).