Create a test case for tables in the layer descriptor

[jkerr5]

If the geometryType of a layer is not present, koop should put the layer into the tables array instead of layers.

Test this by adding a layer without a geometryType property and check the resulting layer descriptor.

[jkerr5]

This appears to be broken in koop right now. I filed koopjs/FeatureServer#89 to address it.

[jkerr5]

Check if this is still an issue