Add acceptedFiles options
Also expose uploadMethod and maxFilesize
Fix highlighting and add temporary preview template
Expose dropzoneEvents and slickEvents
Define more dropzone callbacks
Fix addItem
Prevent unnecessary update after inserting item into DataView
Add onDragover callback and save current upload target
Set the currentTarget on dragenter

Also add onDragenter callback
Add new row to grid upon adding file
Update README
Can dynamically add columns

Also, getRowElem returns a plain HTML node instead of a jQuery object
When expanding an folder, maintain subfolders' collapsed state
Make name column spec a constant
Update README

And add test for changin name column header text
Add error callback
Call user-defined uploadError if upload error occurs
Move error element to renderFile and renderFolder

Also, allow uploadError to fully override dropzone.error callback
Update dropzone
Add stub for uploadProgress