Closes fd for log files on `kill -HUP`. Fixes #230
Merge branch 'master' into 230-close-logfile-fd-on-kill-hup

Conflicts:
	npm-shrinkwrap.json
Merge pull request #231 from CartoDB/230-close-logfile-fd-on-kill-hup

Closes fd for log files on `kill -HUP`