Upgraded flask, werkzeug and Flask-Login packages
lib/decorators: Cast self.msg to unicode before flashing

Usually lazy i18n strings are used in self.msg and the JSON module now
complains that those are not serializable.
Merge branch 'master' into flask-upgrade
test_authentication: Fixed login state tests
Merge pull request #99 from Turbo87/flask-upgrade

Upgraded flask, werkzeug and Flask-Login packages