fix to api changes
added non verbose logging option to cli
give sensu check command tokens access to the full setting hash
added ability to fork ruby checks
have errors raised in checks result in unknown, not critical
added ability to set rabbit prefetch in settings
stringify error output for check and extension logging in server
added ability to gracefully handle poorly formatted json to the determine_stale_clients method in server
added error handling for when a check_exists? method cannot be created because of an invalid check name
version bump to 0.9.12.1