Add ant property and target for running a public server.
Add property for server port as well.
Add a new grid material, my first attempt at a Cesium Material.
Add new grid material to Materials demo in Sandcastle.
Update some wording.
Make Ellipsoids double-sided.
Messing with ellipsoid distances.
Pull out the main computation into a function that can be called twice.

Also fixed an issue with the final alpha value.
Stole some code from this Virtual Globe book I found laying around on @bagnell's desk.

Also commented out picking in the Volume demo because its bugs are driving me completely insane.
Merge pull request #603 from AnalyticalGraphicsInc/double-sided-ellipsoid

Make Ellipsoids double-sided.
Merge remote-tracking branch 'origin/master' into grid-material
Update default thickness.
Merge branch 'grid-material' into ed-test-ellipsoid-dist

Conflicts:
	Apps/Sandcastle/gallery/Volumes.html
	Source/Shaders/EllipsoidFS.glsl
Work in progress
Fix toggling of full-screen button

1. Accidentally broke it when renaming CSS classes
2. Also rename images to match the fact that darker is the new default theme.
Fix line width issue.
Update simple.czml
Make grid lines and other 2D textures not look "bendy" on Ellipsoids.
Rename variable.
Merge branch 'grid-material' into ed-test-ellipsoid-dist