Add script to print daily image resolutions

This is a bit nasty but it does the trick for now. It prints the
resolution of the first and last image of each day stored on S3.
Rename move-images script to process-images

This script was previously just moving images on S3, while it now needs
to download, rotate and push back up to S3. As such, the more generic
'process-images' name feels more appropriate.
Add start and end time, and duration to process-images script

I want to get an idea of how long the script currently takes to run on
my AWS t1.micro instance.
Emit the script name in process-images log messages

This should help differentiate this output from that of the
record-image-information script that also writes to the same cron.log
file on the server.
Emit the script name in record-image-information log messages

This should help differentiate this output from that of the
process-images script that also writes to the same cron.log file on the
server.
Add start and end time, and duration to record-image-information script

I want to get an idea of how long the script currently takes to run on
my AWS t1.micro instance.