title: Difference between done() vs spread() of bluebird
body: <p>Hi I am not getting what is the difference of <code>spread()</code>  vs <code>done()</code> of bluebird library of JavaScript.Even bluebird is wrapper of <code>Q</code> so Q also has both the functions in it's library.</p>
  
  <p>Can anybody explain me what is the difference between both of these functions?</p>
  
  <p>Thanks in advance !</p>