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.

Moved the font-size assignment.

Minor change: put the defaultOptions inside the dropzone prototype.