fix(logger): don't panic on regex fail

If an incoming message did not pass the regex parsing, the logger
would panic and quit. Instead, the logger should log the error to
stderr and keep on truckin'.
fix(logger): don't print to stderr

When using logspout, anything logged with deis-logger was retrieved by
logspout and sent back to deis-logger. This created an infinite loop
because deis-logger would get a message, print it on stderr, logspout
would retrieve the stderr log and send it back to deis-logger.
fix(controller): remove log sidecars

This will be replaced with progrium/logspout running on every
host in the CoreOS cluster.