Only check ast.Name for their id in metaclass check

This should avoid attribute errors for checking the ``id`` attribute on
classes that don't have a basic inheritance declaration.

Closes gh-53

src/pep8ext_naming.py

@@ -180,9 +180,10 @@ class NamingChecker(object):
             if isinstance(meth, ast.Name):
                 late_decoration[meth.id] = self.decorator_to_type[func_name]
+        cls_bases = [b for b in cls_node.bases if isinstance(b, ast.Name)]
         # If this class inherits from `type`, it's a metaclass, and we'll
         # consider all of it's methods to be classmethods.
-        ismetaclass = any(name for name in cls_node.bases if name.id == 'type')
+        ismetaclass = any(name for name in cls_bases if name.id == 'type')
         # iterate over all functions and tag them
         for node in iter_child_nodes(cls_node):

testsuite/N804.py

@@ -27,3 +27,10 @@ class Meta(type):
 class MetaMethod(type):
     def test(cls):
         pass
+#: Okay
+class NotMeta(object):
+    otherclass = Foo
+class AttributeParent(NotMeta.otherclass):
+    pass
+class CallParent(type('_tmp', (), {})):
+    pass