Merge pull request #11 from Innovation-Toolkit/bytea-binary

Add binary datatype support for Postgres BYTEA
Fix adapter.define callbacks to prevent deadlock.

adapter.define and adapter.describe both try spawnConnection,
but adapter.define consumes all of the instances in the
pool (10, by default, in node-postgres) and thus the
adapter.describe function called at the end of adapter.define
results in deadlock (with very nasty effects to your database)