Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/e4a3651efa16
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #18637 from alivedise/bugzilla/1000812/remove-test-apps

Bug 1000812 - Move stuff left in test_apps to dev_apps, r=timdream

========

https://hg.mozilla.org/integration/gaia-central/rev/79c2b01aa590
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1000812 - Move stuff left in test_apps to dev_apps
Bumping manifests a=b2g-bump