.done(function() {
// appCache.start & appCache.update are throttled using the same promise.
// In case appCache.start is called but a promise by a previous
// appCache.update is still pending, we need to make sure that appCache
// nanny still starts the interval checking
if (appCacheNanny.isCheckingForUpdates()) return;
appCacheNanny.start(options);
});
appCache.isCheckingForUpdates = function isCheckingForUpdates() {
return appCacheNanny.isCheckingForUpdates();
};