Log Message:
Update py-flask-security to 1.7.5.

Version 1.7.5
-------------

Released December 2nd 2015

- Added `SECURITY_TOKEN_MAX_AGE` configuration setting
- Fixed calls to `SQLAlchemyUserDatastore.get_user(None)` (this now returns
  `False` instead of raising a `TypeError`
- Fixed URL generation adding extra slashes in some cases (see GitHub #343)
- Fixed handling of trackable IP addresses when the `X-Forwarded-For`
  header contains multiple values
- Include WWW-Authenticate headers in `@auth_required` authentication
  checks
- Fixed error when `check_token` function is used with a json list
- Added support for custom `AnonymousUser` classes
- Restricted `forgot_password` endpoint to anonymous users
- Allowed unauthorized callback to be overridden
- Fixed issue where passwords cannot be reset if currently set to `None`
- Ensured that password reset tokens are invalidated after use
- Updated `is_authenticated` and `is_active` functions to support
  Flask-Login changes
- Various documentation improvements