<commit_before><commit_msg>Add README<commit_after># Silex User Bundle

[Silex](http://silex.sensiolabs.org/) bundle that provides user management, authentication and authorization.

Features:

- supports both [MongoDB](http://www.mongodb.org/) and relational databases
- allows protecting Silex named routes (based on user role definitions)
- allows protecting routes via custom logic
- supports [Persona/BrowserId](https://login.persona.org/) authentication
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