New: better IB integration, better naming.

- overallProgress has been renamed to progress. Bindings will have to be changed accordingly.

- The delegate method fileUpload:uploadsDidProgressOverall: has been renamed to fileUpload:uploadsDidProgress:.

- Eliminated jQueryFileUploadTableCellView.j file, everything is in JQueryFileUpload.j now.

- The dropTarget is now an outlet so it can be connected directly in Xcode.

- You can specify the file class using a string, which allows it to be configured in Xcode with a user-defined runtime attribute.

- You can specify the allowed extensions using a whitespace-delimited string, which allows it to be configured in Xcode with a user-defined runtime attribute.

- All configuration code in the demo was removed, it is all done in Xcode now.

BREAKING CHANGE:

fileUpload:uploadsDidProgressOverall: and overallProgress were renamed, existing usage must be changed.