Added contributors link
Added contributors link

Easier to maintain than manually listing names.
abcantuangco/jquery.dfp.js,BowlingX/jquery.dfp.js,pabloalbizu/jquery.dfp.js,BowlingX/jquery.dfp.js,coop182/jquery.dfp.js,pabloalbizu/jquery.dfp.js,abcantuangco/jquery.dfp.js,coop182/jquery.dfp.js