CMS: initial release of Tools collection

* Introduces "CMS Tools" collection.  (addresses #58)

* Adds CMS VM image record.  (closes #47)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
CMS: primary and reduced dataset record example

* Adds MARCXML record examples for CMS primary and reduced dataset
  records.  (addresses #34)
CMS: new DAS metadata for primary datasets

* More CMS DAS metadata for primary datasets.  (addresses #34)