title: Many to Many join Laravel Eloquent
body: <p>I'm using Laravel 4.1 and i want to make a join with Eloquent: So I have 3 table as: </p>
  
  <p>Table 1 (pools): id, name</p>
  
  <p>Table 2 (contribution): id, amount, pool_id, contributer_id</p>
  
  <p>Table 3 (contributers): id, last_name   </p>
  
  <p>By the way i have 3 models : Pool, Contributer, and Contribution
  Thanks in advance.</p>