- very rudimental support for OUT parameters added; use sql.outparam(name, type)

- very rudimental support for OUT parameters added; use sql.outparam(name, type)
    to set up an OUT parameter, just like bindparam(); after execution, values are
    avaiable via result.out_parameters dictionary. [ticket:507]
- dialect.get_type_map() apparently never worked, not sure why unit test seemed
to work the first time around.
- OracleText doesn't seem to return cx_oracle.LOB.