Rename read-exif.js -> dump-exif.js, to avoid confusion vs. lib/exif/exif-reader.js; convert the various buffers to strings before writing them to stdout.
Image names and urls are of the form yyyy-mm-dd_hh-mm now, instead of ..._hhmm.

Must remember to rename the existing images before purge.py runs tonight, else it will likely do something unfortunate with/to them....
Add a comment. Comments are good.