Properly group tests in output.

The nose.case.Test class wraps all tests and in doing so caused the
output to think all tests belonged to that class. Needed to access the
nose.case.Test.test member in order to get the actual test class.

htmloutput/htmloutput.py

@@ -597,7 +597,7 @@ class HtmlOutput(Plugin):
         rmap = {}
         classes = []
         for n,t,o,e in result_list:
-            cls = t.__class__
+            cls = t.test.__class__
             if not rmap.has_key(cls):
                 rmap[cls] = []
                 classes.append(cls)