Remove old IE hacks as they're no longer supported.
Make S3 region configurable.

Useful for reddit instances not in the US region.
Drop logging of votes by "suspicious" users.

This isn't used.
Remove unused ValidIP validator and is_banned_IP.
Remove branches for skipping queuing when no AMQP host.

An AMQP server has been required for reddit for a long time now and so
these branches are stale and dead.
populatedb: Use queue_vote interface for consistency.

This reduces coupling to the implementation of votes.