Changes

Summary

1. part 2 of book loading via zips (details)

Commit 53f4f8fc422d6a7a8cb01bdc27edbf17b036a58b by progwml6 part 2 of book loading via zips
	src/mantle/books/external/ZipLoader.java (diff)
	src/mantle/lib/client/MantleClientRegistry.java (diff)