owner picture selector in application helper

app/helpers/application_helper.rb

app/views/layouts/application.html.haml

public/images/black_dandy.jpeg

public/images/user/adams.jpeg

public/images/user/buchanan.jpg

public/images/user/buren.jpg

public/images/user/default.jpg

public/images/user/fillmore.jpg

public/images/user/harrison.jpg

public/images/user/jackson.jpg

public/images/user/jefferson.jpg

public/images/user/lincoln.jpg

public/images/user/madison.jpeg

public/images/user/monroe.jpg

public/images/user/pierce.jpg

public/images/user/polk.jpg

public/images/user/quincyadams.jpg

public/images/user/taylor.jpg

public/images/user/tyler.jpeg

public/images/user/washington.jpeg