Can anyone tell me why the dropdown button menu does not show?

application.html.haml

!!! 5
%html{:lang => "en"}
  %head
    %meta{:charset => "utf-8"}
    %meta{:name => "viewport", :content => "width=device-width, initial-scale=1.0"}

    %title
      =content_for?(:title) ? yield(:title) : "Analuk"

    = stylesheet_link_tag "application"
    = javascript_include_tag "vendor/modernizr"
    = csrf_meta_tags

  %body
    %nav{:class => "top-bar"}
      %ul{:class => "title-area"}
        %li{:class => "name"}
          %h1= link_to "Analuk", root_path

      %section{:class => "top-bar-section"}
        -#Right Nav Section
        %ul.right
          %li.active
            = link_to "Right Nav Button Active", root_path
          %a{:href => "#", :data => {"dropdown" => "drop"}, :class => "button dropdown"} Menu
          %br
          %ul#drop.f-dropdown{"data-dropdown-content" => true}
            %li= link_to "Edit profile", edit_user_registration_path
            - if user_signed_in?
              %li= link_to "Sign out", destroy_user_session_path
            - else
              %li= link_to "Sign in", user_session_path

        -#Left Nav Section
        - if user_signed_in?
          %ul{:class => "left"}
            %li= link_to "Profile", current_user
        - else
          %ul{:class => "left"}
            %li= link_to "Sign in", new_user_session_path

    .row
      .small-6.large-2.columns
        -#Insert left sidebar here
      .small-6.large-8.columns
        = yield
      .small-12.large-2.columns
        -#Insert right sidebar here

    = javascript_include_tag "application"

For Foundation 5, try:

%nav.top-bar{"data-options" => "is_hover: false", "data-topbar" => ""}

See foundation docs on Top Bar

Also, I found that I had to load foundation javascript after all of the jquery js files were loaded to get the drop-down to fire.