...ve array

Hello,

Thanks for taking over the project. I updated idiorm with great anticipation and ran into an error on a simple update. Taking the example from the test, the following code:

$widget = ORM::for_table('widget')->find_one(1);
$widget->name = "Fred";
$widget->age = 10;
$widget->save();

passes the test because it is not actually executed. Upon execution, I get the following error:

SQLSTATE[HY093]: Invalid parameter number: parameter was not defined

If I dump out the input parameters sent to execute() (line 1285), I get:

array(3) {
  'name' => string(4) "Fred"
  'age' => int(10)
  [0] => string(1) "1"
}

PDO does not seem to like the mix of named and indexed parameters. This PR fixes this so that the input parameters are all indexed array values.

Gerard