Only log to syslog when --syslog CLI option is passed.

This avoids spamming syslog during development.

We also switch to using the same node-syslog infrastructure as
mw-ocg-latexer, ensuring (for instance) that we log all status information
even when neither -D nor --verbose is passed on the command line.

Change-Id: I7fa067c8991b4a71d44d49082df35f3dfa46dd98
Upgrade domino (use latest version) and tmp (don't swallow exceptions).

Change-Id: I846dc5d654015d40b0e2720b524005d23fee350a