add todo
crontab running by root
install root crontab
map api.bbbike.org to www.bbbike.org, will improve caching for API requests
need sudo to unlink cache files
cache-heater-common no longer needed
reorder cache build commands
no need to run the cache on api.bbbike.org
new command cache-du
fix cache-du
fix quotes
use ./world/bin/bbbike-db --startc $city for routing