Bump preq version
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.
Search Cassandra for local/test keyspaces to drop

Conflicts:
	test/util/cleandb.sh
Add offline test mode / config flag
Log unhandled promise rejections
Use preq 0.3.0
Logging improvements
run swagger specs test before server restart