use active records in library

Libraries are a little different in they don't have immediate access to the `$this` super global.

There's a couple ways to do it but here's how most will tell you to...

PHP Code:

public function __construct()
    {
        $ci = &get_instance();
    } 


Then, anywhere you use '$this->' use '$ci->' instead,

for example:

PHP Code:

public function userExists($id){
        $query = $ci->db->get_where('users', array('id' => $id));
        $number = $query->num_rows();
        if($number > 0)
            return true;
        else
            return false;
    } 


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