Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b8e17a129cc0
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #17636 from viorelaioia/bug_986662

Bug 986662 - Delete some redundant tests

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https://hg.mozilla.org/integration/gaia-central/rev/fd2545058ecc
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 986662 - Delete app object methods

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https://hg.mozilla.org/integration/gaia-central/rev/bfcfb2f6c2d0
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 986662 - Delete tests

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https://hg.mozilla.org/integration/gaia-central/rev/281649134c0e
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Merge pull request #18182 from stasm/993189-settings-once

Bug 993189 - Settings relies on broken mozL10n.ready() behavior. r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/7d70c5447fb6
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 993189 - Settings currently relies on the broken mozL10n.ready() behavior. r=arthurcc
Bumping manifests a=b2g-bump