There is no need for a separate angularjs module, as support for $http is built-in.
Add this to your code:
app.config([function(){
Elpong.enableAutoload(); // when using preloading
}]);
app.run(['$http', function($http){
Elpong.setAjax($http);
}]);Make sure your preloaded meta tags come before the script that loads angularjs.
Then just use Elpong in your controller, or create a factory that returns your scheme.
app.factory('Elpong', ['$window', function($window){
return $window.Elpong;
}]);
app.factory('Scheme', ['Elpong', function(Elpong){
var scheme = Elpong.get('animal-farm');
scheme.setApiUrl('/api');
return scheme;
}]);