made delta builds null-safe.  cleaned up logging
WIP - only run full builds when local fails, is stale, or config has changed materially
local builds only trigger full builds if they fail, are stale, or have changed config.  builds are now run atomically - we no longer wait for all the initial local builds to complete before setting cron jobs, etc.
merging from master
renaming temp to bkup
don't start a full build in no previous config is found.  cleaned up logging
better error message
merging changes
merging from master (delta and startup changes)