2014.12.05 MSS Code Factory 2.1.12682 Stop producing log files

The generation log file has to be created and deleted to avoid sucking
back memory with the backlog buffer, but seeing as I've been running
MSS Code Factory in parallel, the log files haven't even been glanced
at for a couple of years because I know they're garbage.

Use tee to save the stdout and stderr streams of the manufacturing
process instead.