Vendors Compete.

Summary:
Encourage various vendors to publish their RocksDB benchmark.
This will be a central repositiry that will have links to
vendor-published benchmark results.

Test Plan: none.

Reviewers: xjin, haobo, igor, sdong, jamesgpearce

Reviewed By: haobo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D16677
Refine the performance benchmark page.

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Blame Rev:
Cleanup page with place-holders.

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Blame Rev:
Cleanup performance benchmark webpage.

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Blame Rev:
Fine-tune performance page.

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Blame Rev: