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
Add proxying support to node-based server.
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.
Add info about server.js to CHANGES
Include server.js and package.json in zips.  Log a message about running the server directly.
Merge remote-tracking branch 'origin/master' into oneZip
Changes after review

Fix build.xml formatting
Fix typo in index.html
Some minor styling improvements.
Fix npm install on Windows.
isfailure can't handle the case when the resultproperty is not set.
Switch back to two index files

1. index.html can be used for dat to day development and is not included in the zip
2. index.release.html is included in the zip but as index.html
Merge remote-tracking branch 'origin/master' into nodeServer

Conflicts:
	CHANGES.md
Merge remote-tracking branch 'origin/master' into nodeServer

Conflicts:
	CHANGES.md
Merge remote-tracking branch 'origin/master' into oneZip
Use a zipfileset to rename the release version of index.html
Merge pull request #1861 from AnalyticalGraphicsInc/oneZip

Switch the release process to a single zip file
Remove the "built" version of HelloWorld.

This only made sense when we had two zip files.  The "built" version only changed the path to Cesium.js.
Merge branch 'removeBuiltHelloWorld' into nodeServer

Conflicts:
	build.xml
	server.js
Merge pull request #1867 from AnalyticalGraphicsInc/removeBuiltHelloWorld

Remove the "built" version of HelloWorld.