Version 0.2.8

Fixed dumb import auto-added inexplicably.

By default, now gracefully ignores non .gpx / .gpx.gz files. So running something like:

gpxcsv *.*

would skip files that didn't end in .gpx or .gpx.gz

One can raise errors from bad files (and halt multi-file excecution) with the --raise-errors argument. or the errors keyword.