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Features
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- Compatibility with Cassandra 1.1
- Add new API's to get, post and update messages by their message id
- Add new memory storage backend for testing purposes.
- Add metlog based metrics logging.
- Use pycassa's system manager support to programmatically create the
Cassandra schema during startup.
Bug fixes
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- Fix precision errors in server side message id to timestamp conversion.
- Enforce message keys to be valid UUID1 instead of just any UUID.