Pylytics

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- Added support for composite unique keys.

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- Added support for mysql client config files.
- SQL source queries now store the results in memory to prevent read timeouts.

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- Complete rework of pylytics to be more declarative in nature.
- Declaring facts and dimensions is more akin to using an ORM.
- More fine grained control of table and column attributes.
- Better support has been added for non-SQL data sources.
- Pipelining has been added through 'expansions'.
- MySQLdb has been replaced with Oracle's Python connector for MySQL.
- Tests added for large-ish data extractions and transformations.

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- Logging added (including Sentry integration).
- CLI changed to `manage.py command fact`, so beware - CRONs need updating.
- Automatic view generation.

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- bumped version of MySQLdb to the latest version (which fixes an install bug
on Ubuntu).

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- added timezone support.
- updated example.
- dim_date now creates values in the future too.