Gravity Perks File Upload Pro 1.4.2

Added gpfup_uploader_ready JS action so other perks can safely subscribe to GPFUP events after the uploader has initialized. (#49)

Added data-file-type and data-file-ext attributes to each file to enable more specific CSS targeting.
Fixed PHP warning that could occur if Single File Upload fields are present in a form.
Added support for rehydrating File Upload Pro fields connected to Gravity Forms User Registration update feeds.

Fixed issue where the "replacingFile" code flag on the Plupload instance would not be removed after a file had been replaced.