Bing Broken

Bing's maps don't work right now, defaulting to OSM.
1px yellow lost on OpenStreetMap: 2px pink is much better.

Colleen suggested purple and pink, but purple's lost in the black
starfield.
Pink shows up well and 2px is a help too.
1px yellow lost on OpenStreetMap: 2px pink is much better.

Colleen suggested purple and pink, but purple's lost in the black
starfield.
Pink shows up well and 2px is a help too.
Use AGI's Cesium proxy to get ArcGIS map tiles.

AGI offers a /proxy/ service to a restricted set of servers including
the ArcGIS one that I'm using here. This commit is mainly to
demonstrate its use.  There are other maps, including roads, we could use.

We need our own for production, running on our server, to avoid CORS
restrictions accessing data.

(I was trying to get LANDSAT from NASA JPL OnEarth but that seems to
want a proprietary WMS request variant that I can't create -- and also
a proxy to a server which AGI doesn't allow.)
Fix #106 using new Cesium Bing Maps key, other Assets/

Cesium's Bing Maps key expired so their new code gives us a fresh
one.

Might as well use all their Assets as well, so we don't have to
maintain our own SkyBox and static Earth map.  Update the docs to copy
their CesiumUnminified/ directory into our tree as cesium/, then
remove our unnecessary copies.
Fix for JsHint
Fixed 113 Now have atmosphere
FullScreen works on FireFox, Safari, Chrome

But we lose the UI controls and clock due to styling.
Condense browser-specific fullscreen methods
Fullscreen the wrapper, not just cesiumContainer, to get UI controls
Make header title more Jenny-like.
Toggle fullscreen works: Chrome, FireFox, probably Safari; IE???

Safari's hanging, beachballing for me and my fan's wailing, but this
used to work -- going full-screen. I can't test toggling out of
fullscreen though.

And I sure can't test IE-du-jour.
Updated UX

Huge UX update to mirror latest comp.
Updated ISS TLE for testing

TLE's lose 1 to 2 meter's in accuracy per day. Updated to check agreement with other sites.
Typos and HTML5 Validation
Added Hover-Over on Global Display Panel
Update Close Button
Forgot Close button image...

doh
Updating UX
Updated Title