remove "unstable" messaging
remove "unstable" messaging

The word unstable was confusing in meaning and intent.

Fixes: https://github.com/iojs/website/issues/108
PR-URL: https://github.com/iojs/website/issues/112

krahman/website,nodejs/iojs.org,lucasconstantino/iojs.org,appleboy/website,stojanovic/iojs-website,iojs-es/website,deliciousinsights/iojs-website,lucasconstantino/iojs.org,benjamingr/website,mikeal/iojs.org,ruiquelhas/website,deliciousinsights/iojs-website,benjamingr/website,Fishrock123/iojs.org,Wirachmat/iojs.org,ruiquelhas/nodejs-website,diagramatics/iojs.org,nodejs/iojs.org,rstacruz/website,phillipj/iojs.org,rstacruz/website,laosb/iojs.github.io,Fishrock123/iojs.org,LestaD/iojs.org-website,Wirachmat/iojs.org,diagramatics/iojs.org,marocchino/iojs.org,rogeriopvl/website,krahman/website,stojanovic/iojs-website,LestaD/iojs.org-website,phillipj/iojs.org,mikeal/iojs.org,iojs-es/website,marocchino/iojs.org