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
Merge remote-tracking branch 'origin/master' into oneZip
Changes after review

Fix build.xml formatting
Fix typo in index.html
Some minor styling improvements.
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 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