tidy some code and some of the gui

spec/features/authors_spec.rb
    test index gui
spec/views/authors/index.html.haml_spec.rb
    remove unneeded test
app/controllers/authors_controller.rb
    add sorting on index
    tidy indentation
app/views/authors/index.html.haml
    some sortable fields

app/controllers/users_controller.rb
    add sorting on index
    tidy indentation
app/views/users/index.html.haml
    sortable fields

app/views/books/index.html.haml
    more sortable fields
    give the headers sane names instead of twitter-bootstrap insanity

app/views/layouts/application.html.haml
    conditional link to user administration in navbar

flay: 1666
flog: 3010 / 10.1