beta quality!

Added a new cli+shell for interacting with the manga repository.

Switched from reflection to store objects in a JCR node to regular
methods (faster, less flexible, but I believe the data model is stable
enough now).

Switched from enumerating all manga and then displaying them to list
manga to an iterator.  Don't have to hold them all in memory and the
list populates as loaded, instead of loading first then displaying
(feels more responsive).