Issue/fix stored procedure out parameter

[hisame64]

I fixed #5 .
If you run test, you must create Oracle Package before run. (See #4 )

create or replace package calc is
  function sum(a number, b number) return number;
  function twice(a in number, b out number) return varchar2;
end calc;

create or replace package body calc is

  function sum(a number, b number) return number is
  begin
    return a+b;
  end;

  function twice(a in number, b out number) return varchar2 is
  begin
    b := a*2;
    return 'OK';
  end;

end calc;

[hisame64]

Do you not merge this request and not fix any issue?
If you will not fix, I will fork and customize this Oracle driver.

[skie]

This pull request not needed for making out params working. I added new test case today that consfirms that.