added readIfFresh method to simply read only fresh caches.
added readIfFresh method to simply read only fresh caches.

modolabs/Kurogo-Mobile-Web,wesley1001/Kurogo-Mobile-Web,wesley1001/Kurogo-Mobile-Web,modolabs/Kurogo-Mobile-Web,modolabs/Kurogo-Mobile-Web,wesley1001/Kurogo-Mobile-Web