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

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https://hg.mozilla.org/integration/gaia-central/rev/715e2146a0ce
Author: punamdahiya <punamdahiya@yahoo.com>
Desc: Merge pull request #26641 from punamdahiya/Bug1092233-update-gaia-node-module-rev

Bug1092233 - Update marionette-file-manager to 0.0.3 r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/8ff57bd1aa7b
Author: Punam Dahiya <punamdahiya@yahoo.com>
Desc: Bug1092233 - Update marionette-file-manager to 0.0.3 r=kgrandon
Bumping manifests a=b2g-bump