Changed 'split' filter to allow setting the maximum number of splits

mkexp

@@ -302,7 +302,7 @@ template_env.globals['context'] = get_context
 
 # Additional filters
 # - There's a join but no split operation...
-template_env.filters['split'] = lambda x, s: x.split(s)
+template_env.filters['split'] = lambda x, s, m=-1: x.split(s, m)
 # - Add list operations filter and map
 template_env.filters['filter'] = lambda x, f=None: filter(f, x)