Matrix4 - Fix many sample code problems.
Occluder - fixes for sample code.
Display better error messages from node server.js

Also, the "server running" message was being displayed too early.
Merge pull request #2054 from PatMahoney/master

Matrix4 - Fix many sample code problems.
Merge pull request #2060 from AnalyticalGraphicsInc/node-error-msg

Display better error messages from node server.js
Create view-projection matrix in SceneTransforms instead of using the one computed by the uniform state which may cause the transformation to lag by a frame.
Merge pull request #2062 from AnalyticalGraphicsInc/scene-transforms

SceneTransforms view-projection matrix
Misc fixes to sample code.
Since all SceneTransforms tests share state, we need to reset the camera before each tests.

Technically, other things in the scene might be different, but that's the downside of sharing state.
Fix Primitive reference doc
Change I forgot
Add WMS Sandcastle example.
Merge pull request #2064 from AnalyticalGraphicsInc/fix-sceneTransformsSpec

Fix SceneTransforms tests
Add WMS constructor option to disable pickFeatures.
Merge pull request #2068 from AnalyticalGraphicsInc/primitive-ref-doc

Fix Primitive reference doc
Move pickImageryLayerFeatures to ImageryLayerCollection.
Revert unnecessary changes.
Improve pickImageryLayerFeatures test coverage.
Fix CHANGES.md
Remove unnecessary setting of `innerText` property.