[PATCH] Redis Storage Engine

The following patch adds a new storage engine backed by Redis.

By decoupling Kannel from the local filesystem we can make the application
to be a lot more suitable to be run in cloud environments and/or
containers, where a local filesystem cannot be take for granted. It also
increases flexibility, as a server failure would not take the store hostage.

Here's the patch and instructions.

http://www.blogalex.com/archives/328

I'll write the userguide docs if this has chances of making it into the
trunk.

Regards,

Alejandro Guerrieri