Another improvement for datasync.
Stop dev version from emailing suspended members.

I never noticed this until now, but, with the data syncing, it
has become important.
Make datasync save the time of the last run.

This way, it can make smart decisions about what to sync even
when something disrupts the regularity of the cron job.
Merge pull request #20 from djpetti/devel

Another improvement for datasync.