Bump preq version
Merge remote-tracking branch 'wikimedia/master'
Merge remote-tracking branch 'gerrit/master'

Conflicts:
	package.json
Change fall-back log level to 'warn'
Add heapdump to dev dependencies

Including it by default makes it easier to take a heap dump in production (by
sending SIGUSR2) without a need to manually install it there.
Merge pull request #81 from gwicke/master

Misc tweaks