First Pull request for code review - Registration, User Log in, Pagination

Ahh yes po. I had the data needed na po in variables ```php $username``` and ```php $password``` since I did this na po in UserController:

```php
$user->username = Param::get('username');
$user->password = sha1(Param::get('password')); 
```
Thank you po for noticing! :smiley: