If this argument is passed, skip pulling dates from the EXIF data and use it as
the post date.
I recently tried to post a photo that had no EXIF data. This argument provides
an override so the script doesn't 💥 on missing metadata.
Make the script a little more resilient. Print out some EXIF data that the template
will use when generating the page.
Update the photostream submodule commit.
Remove the unused photo_exif_table.html partial.
