sickkk nav. applied to home, rentals/ new show and index, and password/new
Merge pull request #18 from kahny/new_branch

New branch
blocks login/signup in nav if user is signed in. shows first name and logout links instead
adding find current_user to controllers, so nav can access user name
header styling. added to a partial
attempt at fixing height on rental pictures
fixed merge conflicts
Merge pull request #19 from kahny/bootstrap_rental_index

Bootstrap
fixing conflict