Update_many and delete_many bug

[jenssegers]

Both are copies from update() and delete() and contain errors.

It is better to implement them like insert_many():

$results = array();

foreach ($primary_values as $primary_value)
{
    $results[] = $this->update($primary_value, $data, $skip_validation);
}

return $results;

[jamierumbelow]

This is fixed in v1.2.0.