Gave initialize_rjs_reader a closure, and improved the JSON parse error message.
Removed all but three of the epub files. The other files can be made available as addons at a later date.
Temporary revert "Removed all the epub files."
The other files can be made available as addons at a later date."
How are we suppose to handle the addins?

This reverts commit 01632525a2258138a159c69273bbb0f48773c869.