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

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https://hg.mozilla.org/integration/gaia-central/rev/78ec375c2b2d
Author: Fabien Cazenave <fabien@mozilla.com>
Desc: Merge pull request #16613 from Pike/bug-976190-add-Lithuanian

bug 976190, add Lithuanian (lt), f=rq, r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/4ba2e600486a
Author: Axel Hecht <axel@pike.org>
Desc: bug 976190, add Lithuanian (lt), f=rq, r=kaze
Bumping manifests a=b2g-bump
Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/c2ad1f367b62
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #16581 from gaye/kill-extra-copy-of-test-agent

Bug 976152 - Move test-agent off of npm r=lightsofapollo

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https://hg.mozilla.org/integration/gaia-central/rev/3e6170bfc478
Author: Gareth Aye <gaye@mozilla.com>
Desc: Bug 976152 - Move test-agent off of npm r=lightsofapollo
Bumping manifests a=b2g-bump
Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b2b0a8234336
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 975233 - Reorganize the rules for installing node.js modules r=yurenju
Bumping manifests a=b2g-bump
Bug 976032 - check for null callbacks, r=dhylands
Merge b2g-inbound to m-c