Fixed test and add fragments to the list of resets.

IPython/nbconvert/preprocessors/revealhelp.py

@@ -65,8 +65,8 class RevealHelpPreprocessor(Preprocessor):
                         worksheet.cells[index + i].metadata.frag_number = index
                         i += 1
                 #Restart the slide_helper when the cell status is changed
-                #to "do nothing".
-                if cell.metadata.slide_type in ['-']:
+                #to other types.
+                if cell.metadata.slide_type in ['-', 'skip', 'notes', 'fragment']:
                     worksheet.cells[index - 1].metadata.slide_helper = '-'
 
         if not isinstance(resources['reveal'], dict):

IPython/nbconvert/preprocessors/tests/test_revealhelp.py

@@ -82,7 +82,8 class Testrevealhelp(PreprocessorTestsBase):
 
         # Make sure slide end is only applied to the cells preceeding slide 
         # cells.
-        assert 'slide_helper' not in cells[1].metadata
+        assert 'slide_helper' in cells[1].metadata
+        self.assertEqual(cells[1].metadata['slide_helper'], '-')
 
         # Verify 'slide-end'
         assert 'slide_helper' in cells[0].metadata