[작업중]epub3 remote resources

http://www.idpf.org/epub/30/spec/epub30-publications.html#remote-resources

http://www.idpf.org/epub/30/spec/epub30-changes.html#sec-new-changed-remot 

3.10.1 Remote Resources

There are new restrictions on references [Publications30] to remote resources (i.e., Publication Resources not located in the OCF Container). The implications of this change are more fully described in Removal of Filesystem Container.