Move SEED_IDENTITIES constant from WebOfTrust to WebOfTrustInterface:
- We mention it in the JavaDoc of WebOfTrustInterface.WOT_NAME so it's good to have it next to that JavaDoc. 
- Also, the JavaDoc is fixed by this commit to link to the SEED_IDENTITIES constant since it is now visible
- It also is a good idea to mention seed identities in the WebOfTrustInterface as they are an integral part of WOT
Add draft of class MockWebOfTrust:
- A minimal implementor of the WebOfTrustInterface. It will be used in FCPClientReferenceImplementation to ensure that clients which copypaste that class won't have to copypaste the WebOfTrust class.
Resolve FIXME of not requiring a WebOfTrust object in FCPClientReferenceImplementation:
- The code will very likely not execute without throwing NullPointerException yet because MockWebOfTrust is not implemented to provide a fake ObjectContainer yet. The following commits will fix that.