Remove extraneous arguments from textile method

These were originally added long ago to work with django, but markup languages are long gone from django.

Author: ikirudennis

textile/core.py

@@ -1356,7 +1356,7 @@ def _increment_link_index(self):
         return self.linkIndex
 
 
-def textile(text, html_type='xhtml', encoding=None, output=None):
+def textile(text, html_type='xhtml'):
     """
     Apply Textile to a block of text.