Warning about shapeID

[kcoyle]

The program issues a warning for each use of a shapeID that is not in URL form:

  "warnings": {
    "Scholarly Resource": {
      "shapeID": [
        "Value 'Scholarly Resource' does not look like a URI.",
        "Value 'Scholarly Resource' does not look like a URI.",

Because we do not require the shapeID to be a URI, this warning could be confusing. I think it should be removed.