A function that returns an invoice summary used in the InvoiceSummaryProjection @return

* @ngdoc function * @name angular.identity * @module ng * @kind function * * @description * A function that returns its first argument. This fun

* function used as an initial value for watchers. * because it's unique we can easily tell it apart from other values

* @ngdoc service * @name $interval * * @description * Angular's wrapper for `window.setInterval`. The `fn` function is execute

* @ngdoc function * @name angular.isElement * @module ng * @kind function * * @description * Determines if a reference is a DOM element (or wrap

* @ngdoc filter * @name json * @kind function * * @description * Allows you to convert a JavaScript object into JSON string. * * This filte

* @ngdoc filter * @name limitTo * @kind function * * @description * Creates a new array or string containing only a specified number of elements.

* @param str 'key1,key2,...' * @returns {object} in the form of {key1:true, key2:true, ...}

* Closure compiler type information

* @ngdoc function * @name angular.noop * @module ng * @kind function * * @description * A function that performs no operations. This function ca

* Returns the absolute page-offset of the given element.