Feature/distributed saga exclusive locks

[kendallb]

Added support for the new IExclusiveLock API to implement distributed, exclusive locks for Sagas using MySQL.

Collapsed into single commit:

• Use RunSync
• Fix spelling
• Updates for new changes to Rebus PR
• Added support for distributed exclusive saga locks via MySQL tables
• Updates for exclusive locks
• Fixed silly bug where the lead tolerance was not passed into the SQL query, and also fixed a bug where a lease that has actually timed out due to a crash, would block itself from running. So we need to allow the timed out lease message to get replayed once it times out.

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Rebus is MIT-licensed. The code submitted in this pull request needs to carry the MIT license too. By leaving this text in, I hereby acknowledge that the code submitted in the pull request has the MIT license and can be merged with the Rebus codebase.

[mookid8000]

Excellent! It's on NuGet.org as Rebus.MySql 3.0.0-b7 now 🙂

[kendallb]

Awesome. Can we push this out of beta when Rebus 7 is launched?

[mookid8000]

Yes I believe that would be a good time 🙂