Fix RDF and Schema.org links in Metadata Resources

This pull requests fixes a few small bugs:

* Several links to DCAT did not have up-to-date anchors.
* The original document did not have links to Schema.org terms. These have been added.
* `schema` is the usual namespace term for Schema.org, not `sdo` or `ds`.
* `publisher` belongs in the `dcterms` namespace, not the `dcat` namespace. Corrected.
* `dataDictionary`, `dataQuality`, `webService` do not exist in DCAT. Those links to DCAT are removed.
* `spatialCoverage` and `temporalCoverage` are actually named `spatial` and `temporal` on Schema.org.
* `dcat:contactPoint` had been added to the schema, and this change is now reflected here.
* Size, granularity and feed were removed from the schema, and therefore are removed here.

Follows from #57