Renamed BrainStem, added README and README tweaks for the other models

Author: lasalvavida

1.0/2CylinderEngine/README.md

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+# 2 Cylinder Engine
+
+## Screenshot
+
+![screenshot](screenshot/screenshot.png)
+
+## License Information
+
+Data conversion from original JT to COLLADA has been kindly performed by Okino Computer Graphics, using [Okino Polytrans Software](http://www.okino.com/conv/conv.htm).

1.0/2CylinderEngine/README.txt

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+# Box
+## Screenshot
+
+![screenshot](screenshot/screenshot.png)
+
+## License Information
+
+Donated by [Cesium](http://cesiumjs.org/) for glTF testing.

1.0/Box/README.md

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+# Box Animated
+## Screenshot
+
+![screenshot](screenshot/screenshot.gif)
+
+## License Information
+
+Donated by [Cesium](http://cesiumjs.org/) for glTF testing.

1.0/Box/README.txt

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+# Box Semantics
+## Screenshot
+
+![screenshot](screenshot/screenshot.png)
+
+## License Information
+
+Donated by Cesium for glTF testing.  Please follow the [Cesium Trademark Terms and Conditions](https://github.com/AnalyticalGraphicsInc/cesium/wiki/CesiumTrademark.pdf).
+
+## Additional Information
+
+CesiumTexturedBoxTest0FS.glsl and CesiumTexturedBoxTest.gltf were edited to allow test coverage for all uniform semantics.

1.0/BoxAnimated/README.md

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+# Box Textured
+## Screenshot
+
+![screenshot](screenshot/screenshot.png)
+
+## License Information
+
+Donated by Cesium for glTF testing.  Please follow the [Cesium Trademark Terms and Conditions](https://github.com/AnalyticalGraphicsInc/cesium/wiki/CesiumTrademark.pdf).

1.0/BoxAnimated/README.txt

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+# Box Without Indices
+## Screenshot
+
+![screenshot](screenshot/screenshot.png)
+
+## License Information
+
+Donated by [Cesium](http://cesiumjs.org/) for glTF testing.
+
+## Additional Information
+
+This version of the box model has all the indices in order 0-35. When you convert it to glTF, you need to remove the mesh.primitive.indices, so it just renders all vertices in order.

1.0/BoxSemantics/README.md

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+# BrainStem
+## Screenshot
+
+![screenshot](screenshot/screenshot.gif)
+
+## License Information
+BrainStem model created by Keith Hunter and owned by Smith Micro Software, Inc.
+Exported from Poser and made available under clause (g) of “Legitimate Uses” as defined by the  [Poser Pro 11 EULA](http://store.smithmicro.com/sellers/cpstaff/license/PoserPro-EULA.pdf).
+