Hoist HTTPStatus into falcon top-level namespace

Fixes #592

shut up pep8 for unused import

Two spaces before inline comment

Move comment by one space for Pep8

falcon/__init__.py

@@ -34,6 +34,7 @@ from falcon.status_codes import *  # NOQA
 from falcon.errors import *  # NOQA
 from falcon.redirects import *  # NOQA
 from falcon.http_error import HTTPError  # NOQA
+from falcon.http_status import HTTPStatus  # NOQA
 from falcon.util import *  # NOQA
 from falcon.hooks import before, after  # NOQA
 from falcon.request import Request, RequestOptions  # NOQA