Log Message:
json-yaml: Update to 1.2.1

Changes in 1.2.1:
 - Fixed: extraneous error message due to switch fallthrough.

Changes in 1.2:
 - Added: yaml-json to convert YAML back into JSON. Doesn't suport YAML
   aliases yet.
 - Changed: Makefile no longer hardcodes /usr/local/{include,lib}.
 - Changed: no longer requires nonstandard libc headers (err.h).
 - Changed: small documentation tweaks.
 - Removed: cleanup function; let OS handle it.
 - Removed: version number from usage output.