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).
See https://github.com/travis-ci/travis-cookbooks/pull/342. Also, HHVM 3.2.0 will need to be added to this list of changes, and I don't think the php team will release RC3 in time (they always miss the date they advertise for the php 5.6 releases).