initial setup where iterating through mongodb proxy collections instead of regular python lists
buggy. sleepy.
better. not perfect. still initially asks twice for the books. keeps new/edited books through the whole session
edited book gets recognized. and gets out of queue as expected.
deleted compare_lists file. it works. with one user surfing it recognize new/edited/deleted books. now test it with more users.
cleaning up
added books which didn't get to library_uuid to new_books. added space to .opf link so books which starts with number gets valid download link
merged master in refactoring