Add introduction and client libraries sections to vitess.io User Guide#1055

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AndyDiamondstein merged 3 commits intovitessio:masterfrom

AndyDiamondstein:master

Aug 28, 2015

Commits on Aug 28, 2015

Include document explaining schema management to vitess.io User Guide.
AndyDiamondstein
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Add introduction and client library documents to vitess.io User Guide.
AndyDiamondstein
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Merge branch 'master' of https://github.com/AndyDiamondstein/vitess
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