EJTP-console configurable idents and some cleanup

It almost solves #53.

I removed `log` and `clear log` commands.

I created a script to test the interactive console automatically, but didn't added this code to ejtp because it is not clear to me where I can add it. https://gist.github.com/4605176

I did not implemented the filter to use only identities that can be used as senders because it is not clear to me how to do it. I guess it should be implemented in `IdentityCache` or as an `Identity` attribute.