Pull Request 2 Dev 1.1

for readability, if the params contain multiple values, it would be better to place it in it's own variable before passing it in the insert method. 
```
$params = array(
    'thread_id' => $this->thread_id,
    'user_id' => $this->user_id,
    'body' => $this->body
);

$db->insert('comments', $params);
```