transformRequest to make requests made with angular transform Date objects into the long time, rather than iso string

Angular transformRequest Date Long

// untested. Probably works. based off of angular's toJsonReplacer
transformRequest: [function(d) {
	// why is angular.isFile or angular.isBlob not exposed? Who knows! Code copied here
	if (!angular.isObject(d) ||
		Object.prototype.toString.call(d) === '[object File]' ||
		Object.prototype.toString.call(d) === '[object Blob]') {
		return d;
	}

	return JSON.stringify(d, function(key, value) {
		
		if (typeof key === 'string' && key.charAt(0) === '$') {
			return undefined;
		} else if (angular.isWindow(value)) {
			return '$WINDOW';
		} else if (value && document === value) {
			return '$DOCUMENT';
		} else if (angular.isScope(value)) {
			return '$SCOPE';
		} else if (angular.isDate(value)) {
			return value.getTime();
		}

		return val;
	});
}]