Postgresql-audit

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- Fixed ``postgresql_audit.enable_versioning`` parameter to work in situations where the transaction is rolled back and this parameter is set by the rollback operation as an empty string.

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- Changed the use of ``session_replication_role`` to ``postgresql_audit.enable_versioning`` parameter. This change was made in order to allow temporarly disable versioning in environments such as Heroku where changing ``session_replication_role`` configuration setting even on transaction level is impossible. (31)
- Drop and create ``jsonb_substract`` function instead of replacing it (29, courtesy of AdamSelene)

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- Added support for PostgreSQL 10 statement level trigger transition tables. Huge performance boost for heavy inserts.

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- Force timestamps to use UTC as timezone (30, courtesy of quantus)
- Dropped Python 3.3 support

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- Added PostgreSQL 10 support

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- Fixed ``jsonb_subtract`` (jsonb - jsonb) support for arrays as values