change 'Owner ID' to 'Added by' in books index
make some seed and gui improvements

app/views/authors/index.html.haml
app/views/authors/show.html.haml
app/views/books/index.html.haml
app/views/books/show.html.haml
  crosslink where possible and sensible
  change title headers to sane ones

db/seeds.rb
  correct the mismatched tags with books in seed