Add July 2014 VM update announcement

The Android update shall be coordinated with the [documentation update](https://github.com/travis-ci/docs-travis-ci-com/pull/91).
We have 3.1.0? I guess I can skip this, then.

If you can get the cookbooks update for HHVM 3.2.0 in within a day or so, I think we can add it to this update.