Fix Camera.pickEllipsoid during morph

Calling `Camera.pickEllipsoid` during a morph would cause the result parameter to be returned, when in reality the result is `undefined` (which is what we already return when a pick is not on the ellipsoid).  I suppose ideally we would actually support pick ellipsoid during a morph, but that's hardly a feature I ever see being useful.

I added a test, but this is also easily testable with the Sandacastle picking example by showing coordinates under a mouse and then morphing.
Fix DynamicObjectView offset across scenes and from viewFrom DynamicObject property.
Better mouse handling around the camera's constrained axis.
Fix tests.
Merge pull request #1854 from AnalyticalGraphicsInc/morph-pickEllipsoid

Fix Camera.pickEllipsoid during morph
Merge pull request #1858 from AnalyticalGraphicsInc/constrainedAxis

Camera Constrained Axis
Reorder b30 in CHANGES.md
More b30 reordering in CHANGES.md
Switch the release process to a single zip file

1. Only generate a single `Cesium-xxx.zip` file which basically includes the contents of the old `full` versions along with the below changes.
2. Move `server.js` to the top level folder
3. Merge multiple `index.html` files into a single, top-level file.
4. Remove Timeline demo from `index.html` and zip file.
5. Add descriptions and improved styling to `index.html`
6. Add link to WebGL report to the home page
Update index.html
Modify Transforms.pointToWindowCoordinates and SceneTransforms.wgs84ToWindowCoordinates to return coordinates whre the origin is at the top left.
Update CHANGES.md.
Change from review.
Add proxying support to node-based server.
Rename clipToWindowCoordinates -> clipToGLWindowCoordinates.
Make Billboard and Label pixelOffset origin be at the top left corner.
Update CHANGES.md.
Merge branch 'master' into viewFrom
Add command line arguments analagous to the old dev server
Remove included Node.js binaries.  Node is now required to be installed on the system when building.

Also run `npm install` before build steps that require npm modules.