StorageConnector needs to be also able to provide InputStream and Reader objects.
This support complicates a bit the task of closing the stream, in part because
AutoCloseable is not guaranteed to be idempotent (ImageInputStream in not).


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK7@1511393 13f79535-47bb-0310-9956-ffa450edef68