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

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https://hg.mozilla.org/integration/gaia-central/rev/c1eb73a34a80
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #16709 from KevinGrandon/bug_977535_free_up_travis

Bug 977535 - Disable marionette_js_stable_check on travis

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https://hg.mozilla.org/integration/gaia-central/rev/b80741ecb7b2
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 977535 - Disable marionette_js_stable_check on travis r=vingtetun
Bumping manifests a=b2g-bump