Support pylama for python (#2266)

* Add pylama for python
* Consolidate python traceback handling

test/handler/test_vulture_handler.vader

@@ -70,7 +70,7 @@ Execute(Vulture exception should be handled):
   \ [
   \   {
   \     'lnum': 1,
-  \     'text': 'An exception was thrown. See :ALEDetail',
+  \     'text': 'BaddestException: Everything gone wrong (See :ALEDetail)',
   \     'detail': join([
   \       'Traceback (most recent call last):',
   \       '  File "/usr/lib/python3.6/site-packages/vulture/__init__.py", line 13, in <module>',