Update Tile diagram about 3d-tiles HOT 6 CLOSED

@slchow can you please update this image?

• Remove type
• Remove batchSize
• Change box to boundingVolume

As I attempted to illustrate here:

The schema is here:

• tile
• content
• boundingVolume

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@pjcozzi How does this look? Let me know if you need changes. When it's final I'll also send the eps.

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Thanks. Can we make a few tweaks:

• bounding volume should be boundingVolume (these should match the format's actual names)
• geometric error should be geometricError
• Region should be more curved like this (see how it curves around Earth):

When this is ready, can you open a PR to update the .eps and .png file here: https://github.com/AnalyticalGraphicsInc/3d-tiles/tree/master/figures

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Also, Tile should be tile.

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Updated in #83.

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