removed unnecessary goog.require from logos.model.Model
added npm script 'doc', for generating closure jsdoc
WIP: Currently specs will not pass and the tree will not compile. Need to
complete work below:

Adds the base implementation for CommandApplier and command transformation. Need
to complete implementations of logos.model.Object#equals methods and
logos.model.Command#equals methods from the EqualsComparable interface. Needs
specs.

* adds CommandApplier and CommandHistory implementations
* adds #transform logic to Command and CommandSet
* adds logos.event.EventBus