Disable the sld example and its tests.
Disable the sld example and its tests.

The geoserver we were using has gone offline.  Until it comes back
online or we choose a different geoserver, this example will not work
and will cause tests to fail.

Kitware/geojs,OpenGeoscience/geojs,Kitware/geojs,Kitware/geojs,OpenGeoscience/geojs,OpenGeoscience/geojs