title: use createHash in angular-md5
body: <p>When I wanna use the createHash function in angular, this error raises : <code>md5.createHash is not a function</code></p>
  
  <p>Here's my code :</p>
  
  <pre><code>MyCtrl.$inject = ['md5'];
  function MyCtrl(md5) {
  var vm = this;
  
  vm.reg = reg;
  
  function reg() {
      vm.avatar = md5.createHash('salam'); // This Line Has Error
      console.log(vm.avatar);
  ...
  </code></pre>
  
  <p>Note: I added the module dependency fine !</p>