Fix voting when template_debug=true.

Remove leading/trailing whitespace from thing_css_class for printables.
Fixes #85.

r2/r2/public/static/js/jquery.reddit.js

@@ -331,7 +331,7 @@ $.fn.thing_id = function(class_filter) {
         t = t.find("." + class_filter + ":first");
     }
     if(t.length) {
-        var id = $.grep(t.get(0).className.split(' '),
+        var id = $.grep(t.get(0).className.match(/\S+/g),
                         function(i) { return i.match(/^id-/); }); 
         return (id.length) ? id[0].slice(3, id[0].length) : "";
     }

r2/r2/templates/printable.html

@@ -45,9 +45,7 @@ ${self.RenderPrintable()}
   %endif
 </%def>
 
-<%def name="thing_css_class(what)">
-thing id-${what._fullname}
-</%def>
+<%def name="thing_css_class(what)">thing id-${what._fullname}</%def>
 
 <%def name="RenderPrintable()">
 <% cls = thing.lookups[0].__class__.__name__.lower() %>