Werkzeug stub fixes (#2229)

* Fix stub for werkzeug.exceptions.Aborter and abort

* `werkzeug.exceptions.abort` [1] was missing and is thus added here.
  It's also commonly used in Flask as `flask.abort`.
* They both always raise [2], hence the `NoReturn` return type.

[1]: http://werkzeug.pocoo.org/docs/0.14/exceptions/#werkzeug.exceptions.abort
[2]: d129d17066/werkzeug/exceptions.py (L708-L713)

* Fix stub for werkzeug.wrappers.AuthorizationMixin

The code [1] uses `@cached_property` [2], which is basically a Python
property, and optionally returns an `Authorization` [3] object.

[1]: d129d17066/werkzeug/wrappers.py (L1462-L1466)
[2]: d129d17066/werkzeug/utils.py (L35)
[3]: d129d17066/werkzeug/datastructures.py (L2438)

third_party/2and3/werkzeug/exceptions.pyi

@@ -1,4 +1,4 @@
-from typing import Any, Dict
+from typing import Any, Dict, NoReturn
 
 class HTTPException(Exception):
     code = ...  # type: Any
@@ -147,4 +147,6 @@ class HTTPVersionNotSupported(HTTPException):
 class Aborter:
     mapping = ...  # type: Any
     def __init__(self, mapping=None, extra=None): ...
-    def __call__(self, code, *args, **kwargs): ...
+    def __call__(self, code, *args, **kwargs) -> NoReturn: ...
+
+def abort(status: Any, *args: Any, **kwargs: Any) -> NoReturn: ...

third_party/2and3/werkzeug/wrappers.pyi

@@ -6,7 +6,7 @@ from typing import (
 from wsgiref.types import WSGIEnvironment, InputStream
 
 from .datastructures import (
-    CombinedMultiDict, EnvironHeaders, Headers, ImmutableMultiDict,
+    Authorization, CombinedMultiDict, EnvironHeaders, Headers, ImmutableMultiDict,
     MultiDict, TypeConversionDict, HeaderSet,
 )
 
@@ -139,7 +139,8 @@ class UserAgentMixin:
     def user_agent(self): ...
 
 class AuthorizationMixin:
-    def authorization(self): ...
+    @property
+    def authorization(self) -> Optional[Authorization]: ...
 
 class StreamOnlyMixin:
     disable_data_descriptor = ...  # type: Any