Review security support in node-wot

[mmccool]

Review security implementation in node-wot to ensure it is consistent with the specification. This should include the security configuration API for managing out-of-band information (like keys) not in the TD, and should ensure all TD possibilities are covered (in particular, multiple security configurations on different forms).

See also #73

[mmccool]

Cristiano has agreed for a start to give us a walk-through of node-wot's API and the implementation.

[relu91]

I set up a small repository to start testing node-wot security. You can find it here. In the next call, we can explore it.