Drops the local database.

def drop_db():
    """Drops the local database."""
    local_machine()
    with fab_settings(warn_only=True):
        local('psql {0} -c "DROP DATABASE {1}"'.format(
            USER_AND_HOST, env.db_name))
        local('psql {0} -c "DROP USER {1}"'.format(
            USER_AND_HOST, env.db_role))