Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/8718790784b5
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #18140 from hfiguiere/bug980541

Bug 980541 - Update the gaia-node-modules revision for marionette-client 1.1.5

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https://hg.mozilla.org/integration/gaia-central/rev/944238bb2a87
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 980541 - Update the gaia-node-modules revision for marionette-client 1.1.5. r=

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https://hg.mozilla.org/integration/gaia-central/rev/1ea3ed0367d1
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #18181 from AndreiH/bug_994703

Bug 994703 - [master] test_browser_bookmark is failing

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https://hg.mozilla.org/integration/gaia-central/rev/07ad9d48d879
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 994703 - [master] test_browser_bookmark is failing
Bumping manifests a=b2g-bump