adds author model and relationship to books; adds seed data for authors #23
moves last_first helper to author #23
add authors controller; adds author_attributes to book controller; adds nested attributes to book model; adds author fields to book form; adds correct author fields to views #23
updates specs for separate author model #23
adds jQuery autocomplete for author #23
updates test for author last, first input #23
splits comma separated author name to save or assign to existing author #23
add spec for author autosave author records #23
specs passing #23