Cleanup JolocomRegistry creation

[mnzaki]

Description

In an effort to differentiate between the "jolocom method based registry" and the canonical jolocom registry, the createJolocomRegistry helper should return the canonical jolocom registry (no configurable anything). The logic inside createJolocomRegistry is construction logic that needs to go into the constructor

The registry class itself can get a name that better reflects that it is the "jolocom method based registry" and strictly for jolocom's own canonical registry, because JolocomRegistry is ambiguous

Part of #355

TODO

• rename registry?
• move out logic from createJolocomRegistry and make it non-configurable