tranfer to BIDS now gives status updates
tranfer to BIDS now gives status updates

two changes to transfer_to_BIDS.py:

 - it now prints out status updates after each major step

 - if an IOError is raised in the prisma_to_BIDS functions (because the
   destination folder already exists), then a warning is printed and we
   move on to the next bit. we don't do this for th tsvs, behavioral
   data, or notes, because they're all very small and so don't take any
   time

billbrod/spatial-frequency-preferences,billbrod/spatial-frequency-preferences,billbrod/spatial-frequency-preferences