Update the quer_filter spliting method to handle superior.nature field notation.

Update the associated tests

leobject/leobject.py

@@ -157,7 +157,7 @@ class _LeObject(object):
         for operator in cls._query_operators[1:]:
             op_re_piece += '|(%s)'%operator.replace(' ', '\s')
         op_re_piece += ')'
-        cls._query_re = re.compile('^\s*(?P<field>[a-z_][a-z0-9\-_]*)\s*'+op_re_piece+'\s*(?P<value>[^<>=!].*)\s*$', flags=re.IGNORECASE)
+        cls._query_re = re.compile('^\s*(?P<field>(superior\.)?[a-z_][a-z0-9\-_]*)\s*'+op_re_piece+'\s*(?P<value>[^<>=!].*)\s*$', flags=re.IGNORECASE)
         pass
 
 class LeObjectError(Exception):

leobject/test/test_leobject.py

@@ -25,6 +25,7 @@ class _LeObjectTestCase(TestCase):
             "hello \nnot\tin \nfoo":('hello', ' not in ', 'foo'),
             'hello != bar':('hello', '!=', 'bar'),
             'hello = "world>= <= != in not in"': ('hello', '=', '"world>= <= != in not in"'),
+            'superior.parent = 13': ('superior.parent', '=', '13'),
         }
         for query, result in query_results.items():
             res = _LeObject._split_filter(query)
@@ -42,6 +43,7 @@ class _LeObjectTestCase(TestCase):
             '=',
             '42',
             '"hello" = world',
+            'foo.bar = 15',
         ]
         for query in invalid_queries:
             with self.assertRaises(ValueError, msg='But the query was not valid : "%s"'%query):