Log to stdout

[janwendt]

I am using scrapyrt in Google App Engine. To save the logs in Google Cloud i need to log to stdout but scrapyrt does not support that see:

scrapyrt/scrapyrt/log.py

Lines 135 to 137 in f8ee7b7

	# Looging stdout is a bad idea when mutiple crawls are running
	# if settings.getbool('LOG_STDOUT'):
	# sys.stdout = StreamLogger(logging.getLogger('stdout'))

Everyone who wants to use scrapyrt in production and wants to deploy it on any kind of cloud platform needs this feature.

I would help creating a PR if desired. Any Ideas @pawelmhm ?

[pawelmhm]

Sorry for late response. Sure create PR if still needed.