added getRow and getResult to actually fetch data
added getRow and getResult to actually fetch data

- added this method in case MY_Model does not include a specific 
functionality, e.g. you want to use $this->db->or_where_not_in(...),
but don't fetch the result manually by 
$this->db->get($this->table)->row(..)/result(..), to take advantage of
MY_Models $table and $returnType
Urastor/CI-BaseModel