fixes #15
Removed dependency from fancybox (reopen #13).
Improved work with repositories.
Improved implementation of repository for DS.
Improved code for managing users.
Improved design of pages.
Removed support of voting for offered books (cancels #10).
In future we try to find better solution for this issue.
Set fake email address.
Improved markup.
Added list of subscribers with new design.
Merge branch 'develop' of https://github.com/grytsenko/library into develop
Merged changes