Fixed geocoder test
Fix tests that assume an extension is available or have a DeveloperError/RuntimeError mismatch.
Merge pull request #1502 from AnalyticalGraphicsInc/extensionTests

Fix tests that use WebGL extensions
Merge pull request #1503 from AnalyticalGraphicsInc/geocoder

Fixed geocoder test failure
Merge remote-tracking branch 'origin/master' into gltf
Merge branch 'gltf' into gltfDefaults