Add CBZ support to Read; fixes #4241

Replaces #2

Add comic book zip support to read activity.  Test files:  http://www.contrapositivediary.com/?p=1197

Google code in task:  https://www.google-melange.com/gci/task/view/google/gci2014/5279299879829504

Bug:  http://bugs.sugarlabs.org/ticket/4241