Error comparing the @contexts

[AndreaCimminoArriaga]

The Directory injects in the TDs the registration information (this is taken into account in the tests). However, the @context is also modified (since the @context of discovery must be added to the terms related are compliant with the ontology). Currently, the tests require that a pre-registered TD has the same context as a registered one, which can not be true.

I can create a PR that removes the comparison of these contexts.

[farshidtz]

For now, I've set it to ignore context; see #10.

We have to revisit this once w3c/wot-discovery#291 is reolved.