implemented Serializable interface for apc cache.
created cache for Dimplet.
use Cache to store object.
nothing to return.
specify the class for objectCache.
slightly shorten the (un)serialize methods.
removed todo; done.
dbConnect to handle various $pdo.
specify what is self::$_container is.
made Cache as static since apc works like static.
initialize is a static method.
use Dimplet's getInstance to get dimplet container in Core.
use common name to create id; but apc cache disabled for now.
fetch/store cache using $id as well.
more refactoring on re-connecting logic.