Flatten dropzone-widget events
Flatten dropzone-widget events

- Pass in listeners as individual properties
- Work around Dropzone rebinding listeners

baylee-d/ember-osf,hmoco/ember-osf,jamescdavis/ember-osf,jamescdavis/ember-osf,binoculars/ember-osf,chrisseto/ember-osf,CenterForOpenScience/ember-osf,pattisdr/ember-osf,chrisseto/ember-osf,pattisdr/ember-osf,crcresearch/ember-osf,binoculars/ember-osf,cwilli34/ember-osf,CenterForOpenScience/ember-osf,crcresearch/ember-osf,hmoco/ember-osf,cwilli34/ember-osf,baylee-d/ember-osf