Notify user if error occurs on download.
Notify user if error occurs on download.

Pop up an error dialog if an upload error occurs during the download
workflow. This indicates a problem that will not allow the rspec to be
downloaded. Better than a dead button.

charliemeyer/geni-portal,charliemeyer/geni-portal,tcmitchell/geni-portal,tcmitchell/geni-portal,charliemeyer/geni-portal,tcmitchell/geni-portal,charliemeyer/geni-portal,tcmitchell/geni-portal,tcmitchell/geni-portal,charliemeyer/geni-portal