Update algorithm output to be the serialized canonical form

[gkellogg]

Update definition of "normalized dataset" to be an RDF dataset and an ordered map mapping canonical labels to blank nodes within that dataset.

Update the result of the canonicalization algorithm to be the serialized canonical form of that normalized dataset.

Fixes #4. Fixes #92.

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[peacekeeper]

I think to complete #4, this is still missing some language about how implementations may change stable blank node identifiers before serialization, or change the order of serialized N-Quads, or something like that.

[TallTed]

(editorial) Fairly minor but clarifying, I think.

[gkellogg]

I think to complete #4, this is still missing some language about how implementations may change stable blank node identifiers before serialization, or change the order of serialized N-Quads, or something like that.

I thought about that, but not sure where the wording would go. The branching point is at step 7 in the Canonicalization Algorithm. Clearly, the serializer could be called with an alternative dataset that uses a different mapping and an implementation could insert steps before step 7 to perform some operations on the normalized dataset to create such an alternative map.