redding/ardb — pull request #43 by kellyredding (2013-06-22 12:57:01+00:00)
Title: ignore "does not exist" errors when dropping a pg db

This makes the operation less "noisy" when you drop a db that
doesn't exist and generally makes the cmd less annoying on the
user.

This also more closely matches the sqlite adapter only removing
the db file if it exists.

@jcredding ready for review.