Amsterdam-schema-tools

* Add possibility to use git commit hashes when creating SQL migrations
from amsterdam schema table definitions.

* Bugfix: Update nested table when nested field name has underscore.
* Bugfix: Update parent table when parent table has shortname for update events.
* Bugfix: Only check for row existence when table exists.

* Bugfix: Ignore id when copying data from temp table to main table for nested tables.

* Bugfix: Snake case temp table schema name in EventProcessor.

* Bugfix: Don't try to create schema if schema already exists. Fails on 'create schema'
permissions.

* Bugfix: Fixed issue where duplicate indexes were created