Description:
    The sql_session_store generator creates a migration for use with
    the sql session store.  It takes one argument: the database
    type. Only mysql and postgreql are currently supported.

Example:
    ./script/generate sql_session_store mysql

    This will create the following migration:

      db/migrate/XXX_add_sql_session.rb

    Use

    ./script/generate sql_session_store postgreql

    to get a migration for postgres.