Updating README.md
Removing small tag from README
Fixing path to moon map image on README
Updating README.md
Changes
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* Removed unused moon maps.
* Added a normal map created using nvidia's plugin for photoshop.
* Adding a new scene file `normal.js` which uses the normal map.
* Adding a new file `normal.html` which runs the new `normal.js` script.
* Adding a new set of shaders for using the normal map in `normal.html`.