Added an init() option function.

Fixed disabling of Dropzone and added an enable() function.

Fixed the formData.append bug.

Setting a different previewsContainer is now possible.

Added the enqueueForUpload option and a .disable() call.

Added the possibility to add parameters for each file upload.

Added removeFile() functionality.

Fixed the file input name in fallback forms.

Added the `sending` event.

Child elements of the dropzone aren't clickable anymore and renamed t…

…he finished event to success.