!!!
%html
  %head
    %meta{:name => "viewport", :content => "width=device-width, initial-scale=1.0"}
    %title= content_for?(:title) ? yield(:title) : 'Happenin'
    %meta{:name => "description", :content => "#{content_for?(:description) ? yield(:description) : 'Happenin'}"}
    = stylesheet_link_tag 'application', media: 'all'
    = javascript_include_tag 'vendor/modernizr'
    = javascript_include_tag 'application'
    = csrf_meta_tags
  %body
    %header
      = render 'layouts/navigation'
    %main{:role => "main"}
      = render 'layouts/messages'
      = yield

!!!
%html
  %head
    %meta{ name: 'viewport', content: 'width=device-width, initial-scale=1.0' }
    %title= content_for?(:title) ? yield(:title) : 'Happenin'
    %meta{ name: 'description', content: "#{content_for?(:description) ? yield(:description) : 'Happenin'}" }
    = stylesheet_link_tag 'application', media: 'all'
    = javascript_include_tag 'vendor/modernizr'
    = javascript_include_tag 'application'
    = csrf_meta_tags
  %body
    %header
      = render 'layouts/navigation'
    %main{:role => "main"}
      = render 'layouts/messages'
      = yield

Change 'layouts/application' strings to use single-quotes
Change 'layouts/application' strings to use single-quotes
