This will allow characters such as '-' in database role
names. Additionally, escaping of '"' characters now applies to all '"'
characters, not just the first in a sql command.
Renamed a few files and made some tweaks to try to get
database_grant, database_user, and database types into
a state where they work very similarly to the ones in
the mysql module. Also introduced a "postgresql_password"
function that can be used to generate an md5 password
hash for a postgres user.
