Add spec for multiple-association response where primary keys are returned and multiple finds for those associations need to be called in the model.
Allow models to intuit the providers their associations belong to if the name of the provider is the same as the name of the association. E.g.:

	function System(data) {
		this.hasMany('sensors');
	}

No provider needs to be declared as long as the name of the provider is "Sensor". 

Add the ability to declare foreign keys (though these aren't yet used). 

Handle $saves where multiple foreign keys are returned and need to be looked up, possibly calling multiple async $http requests to the API for these associations to populate. 

Declare belongs to associations as enumerable, so they now show up on the instances.
Add async lib to bower.json
Add async lib to bower-unit.conf.js
Use new provider/foreign-key syntax in model declarations