waitfor array

[RickButler]

Add the ability to use an array of string paths for waitFor.

some random things included in this:
remove unused require statements
normalize spacing around function declarations

[RickButler]

I'm constantly creating derived properties to test for successful fetching of data before rendering a subview.

for example I will have a view with two models (or more).

children: {
    exampleModelOne: MyModel,
    exampleModelTwo: MyModel
}

I have properties that I set when they have been fetched . I then have a derived listening to these props.

derived: {
    viewReady: {
        deps: ['exampleModelOne.fetched', 'exampleModelTwo.fetched'],
        fn: function () { return this.exampleModelOne.fetched && this.exampleModelTwo.fetched; }
}

and then:

subview: {
    myStuff: {
        selector: '[data-hook=collection-container]',
        waitFor: 'viewReady',
        prepareView: function (el) { //do stuff }
    }
}

This would allow skipping the derived and instead just using multiple waitFor:

subview: {
    myStuff: {
        selector: '[data-hook=collection-container]',
        waitFor: ['exampleModelOne.fetched', exampleModelTwo.fetched],
        prepareView: function (el) { //do stuff }
    }
}

The overhead for this would be no worse than creating the derived, the average case may event be better because once 'action' gets called it removes the event listener, instead of the derived catching changes for its deps and any other overall "change" events for the entire lifecycle of the view.

Looking for someone else to sign off on this since I wrote it, @dhritzkiv if you have some time maybe?