Announce the August 2014 build env updates

Here are planned updates to the build environments for August, 2014.

This includes move to Leiningen 2.4.3 as the default; be sure to merge https://github.com/travis-ci/travis-cookbooks/pull/361 before creating the JVM image.
there is a difference between dashes?

why not remove the `august` part as the date is already in the permalink?