title: dropzone.js maxfilesexceeded event not firing
body: <p>I have been looking around and playing for a little while now with the dropzone.js library and cannot get the <a href="http://www.dropzonejs.com/#event-maxfilesexceeded" rel="nofollow noreferrer">maxfilesexceeded event</a> to fire. I have looked at the <a href="https://stackoverflow.com/questions/18048825/how-to-limit-the-number-of-dropzone-js-files-uploaded">How to limit the number of dropzone.js files uploaded?</a> post for info and have updated to the latest version of the library but the event still wont fire.</p>
  
  <p>I am initialising the listener in the init() function as suggested in the post above. I am able to catch the <code>maxfilesreached</code> event but not the <code>maxfilesexceeded</code> event</p>
  
  <pre><code>$scope.fileUploadConfig = {
      options: {
          url: uploadFileURL,
          maxThumbnailFilesize: 200,
          maxFiles: 5,
          uploadMultiple: false,
          acceptedFiles: "application/vnd.oasis.opendocument.text,application/rtf,application/pdf,application/msword,application/vnd.openxmlformats-officedocument.wordprocessingml.document,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet,application/vnd.ms-excel,.xls,.xlsx,application/vnd.ms-powerpoint,application/vnd.openxmlformats-officedocument.presentationml.presentation,.ppt,.pptx,image/*,.mp3,.m4a,.ogg,.wav,.wma",
          addRemoveLinks: true,
          paramName: "file",
          dictRemoveFile: "Remove",
          clickable: true,
          previewTemplate: $("#dropzone-preview-template").html(),
          init: function() {
              var instance = this,
                  selectedPageId = 0;
  
              instance.on("success", function(event, data) {
                  /* ... */
              });
  
              instance.on("addedfile", function() {
                  /* ... */ 
              });
  
              instance.on("removedfile", function(file) {
                  /* ... */
              });
  
              instance.on("maxfilesreached", function(file) {
                  alert("MAX_FILES_REACHED");
              });
  
              instance.on("maxfilesexceeded", function(file) {
                  alert("MAX_FILES_EXCEEDED");
              });
          }
      }
  };
  </code></pre>
  
  <p>All the code is working as expected except for the maxfilesexceeded event.</p>