support login with Authorization header
Fire `user_loaded_from_cookie` even if token loader provided
Fix UserMixin hashing with Python 3
0.2.8
Enable localisation of flash messages

Since Flask upgraded to 0.10, it's no longer possible to use
`lazy_gettext` to set `LoginManager.login_message`.

Add an optional `localization_function` argument/attribute to be called
with flash messages if the method is present.
Enable localisation of flash messages

Since Flask upgraded to 0.10, it's no longer possible to use
`lazy_gettext` to set `LoginManager.login_message`.

Add an optional `localizer` function as an argument/attribute to be
called on messages before they're "flashed".
Document localization

Add shitty documentation of `localizer` argument/function.
Alter to match other optional callbacks and add tests

Change to `localize_callback` attribute to match other callbacks.

Add corresponding tests to maintain 100% coverage.

Update documentation to reflect changes.
Correct formatting in documentation
Remove blank line for PEP8
Merge with upstream