TeamHG-Memex / agnostic / 15

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travis-ci

Fix some issues with Postgres backend.

1. The pg8000 driver can't executed multiple statements in a single
   call to execute(). So I added the `sqlparse` library so that blocks
   of SQL can be parsed into separate statements and executed one-
   at-a-time. I added tests to both backends to cover this condition.
2. The clear_db() method failed to drop types, but I didn't notice
   because there were no custom types in the test migrations. I added
   a custom type to the test cases and then fixed the bug.

Also updated Travis/Docker testing configuration, updated badges
to include a new PyPI badge, and fixed an issue where the wrong
exception type was being raised in create_backend().

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