Remove the Linux-specific vmstat -n flag. It breaks portability with the BSDs and Solaris and doesn't actually impact how the collector works.
Add OS detection to the vmstat field parsing. Only Linux has split idle into wait time. Neither Solaris nor the BSDs do this.
Remove OS conditional. Set wait column as optional. Add comment.
collectors/cpu/cpu        - fix `want` hash, skip needless `{}` output

CHANGELOG.md              - annotated
lib/panoptimon/version.rb - version bump