Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/ef77bd6f1f60
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 1067731 - Display immediately WAP Push signal indication messages with the signal-high action set r=julienw

========

https://hg.mozilla.org/integration/gaia-central/rev/17bd25b27c03
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #26666 from KevinGrandon/bug_1108874_marionette_actions

Bug 1108874 - Create a loader for MarionetteJS Actions

========

https://hg.mozilla.org/integration/gaia-central/rev/108fff548e6b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1108874 - Create a loader for MarionetteJS Actions
Bumping manifests a=b2g-bump