cookie as session store

[prepor]

Hello! How to implement signed-cookie based session store? For setup cookies we need access to context or use returned value from write-session as new session key (like ring session stores).

[niwinz]

Hmm. The current design does not allows that, so I think we can rethink it and improve it for the next version.

[niwinz]

The session storage is refactored and will be available on the next version (0.8.0) if you want hack with it you can use the 0.8.0-SNAPSHOT.

Also, a jws cookie signed storage is implemented.