First stab at Heroku PostgreSQL.
Define profile in Procfile.
Heroku profile activation, properties.
Added Hibernate driver property.
Hmm, perhaps PostgreSQL drivers would help?
Set PoolProperties, incl. driver name.
Renaming User table to "registered_user".

PosgreSQL barfs on a table called "user", it's a reserved word.
Merge remote-tracking branch 'origin/master' into enable_heroku_postgresql