Order artists by visible first in admin (fixed #163)
Allow sorting by visible artists in admin
fixed initial migration in makefile

quoted so that foreman wouldn't try to interpret options as options to foreman
Added Book List (fixed #152)
Allowed only year or year + month for book date (fixed #151)
Reset migrations, because of problems changing field type
Corrected test for book url to reflect new description (#157)
Fixed book test to use year instead of date field (#151)
Fix artist test for no book link, if artist has no books, to allow the nav book link (#152)
Don't show non critical logging on tests
Add make command to run tests continuously
Invalidate book list when saving book (#152)
Re-run tests while untracked file changes in `run-tests` make command
Added book list test (#152)