bugfix: on linux stats -c %B returns the block size while we expect a date here, changed to %B to %Y to get the last modified date
removed ending 'd' from tag names DateTimeOriginald and DateTimed, seems it is a typo error
Some EXIF contains zero date like 0000:00:00... Script was crashing in this case, FIX : detect zero date and fallback to next date detection method for all EXIF dates check.
Merge pull request #3 from cedricbou/master

Linux compatibility and EXIF data fixes.  Fixes #3