Document 0.9.9 release date

Add Ruby 2.1 instruction to the Nginx example config

Bump version to 0.9.7 and upgrade to baseimage-docker 0.9.7.

Remove mention of the insecure key being enabled by default, because …

…that's no longer true

Upgrade to baseimage-docker 0.9.4 and bump version to 0.9.5

Update README

Bump version to 0.9.2

Split the build task into a build_full and build_minimal

Add a release task