Bump to polyglot 1.6.0 release.
Bump to polyglot 1.6.0 release.

kbaribeau/immutant,coopsource/immutant,immutant/immutant,immutant/immutant,coopsource/immutant,kbaribeau/immutant,coopsource/immutant,immutant/immutant,kbaribeau/immutant,immutant/immutant