default xhtml strict doctype

lib/middleman/template/views/layout.haml

@@ -1,7 +1,11 @@
-%html
+!!! Strict
+%html{ :xmlns => "http://www.w3.org/1999/xhtml", "xml:lang" => "en", :lang => "en" }
   %head
+    %meta{ :content => "text/html; charset=utf-8", "http-equiv" => "Content-Type" }
     // Comment in layout
     = stylesheet_link_tag "site.css"
+    :javascript
+      // Comment in javascript
     = yield_content :head
     
   %body{ :class => page_classes }