Why not use a promise?

I was using this and thought I should make it use a promise. I ended up with something like this.. it seems a lot better:

``` js
angular.module('btford.phonegap.ready', []).
factory('phonegapReady', function ($rootScope, $q) {
var loadingDeferred = $q.defer();
document.addEventListener('deviceready', function() {
$rootScope.$apply(loadingDeferred.resolve);
});
return function phonegapReady() {
return loadingDeferred.promise;
};
});
```

After phonegap is loaded, the promise always instantly resolves.

It's just used like this:

``` js
phonegapReady().then(function() {
doStuff();
}});
```

Start at the phonegapReady factory and its deviceready listener; compare the current API with the promise-based example in the issue. Verify that phonegapReady() returns a promise and that the promise resolves after deviceready, including when called after PhoneGap has loaded.

Written by the indexing model from the issue text.