Fixing a bug in tablet healthL would not clear
the health map when it goes empty.
Adding test for health check propagation.
Merge branch 'master' of github.com:youtube/vitess
Create Contributing.markdown
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Update GettingStarted.markdown
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Removing topo.Server.CreateShardReplication.

Using UpdateShardReplicationFields in all cases, less
confusing and then the 'Tee' support works all the time.
This is actually a lot less code.
Merge branch 'replication'
VTGate V2 update
Fix VTGate V2 unit test
Make the txlogz and queryz tables sortable.
VTGate V2 update