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

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https://hg.mozilla.org/integration/gaia-central/rev/1548329b856e
Author: dwi2 <dwi2@dwi2.com>
Desc: Merge pull request #14338 from dwi2/bug942762

Bug 942762 - Update label of bookmark on homescreen when user update boo...

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https://hg.mozilla.org/integration/gaia-central/rev/70e1bab60d48
Author: tzhuang <tzhuang@mozilla.com>
Desc: Bug 942762 - Update label of bookmark on homescreen when user update bookmark name in browser

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https://hg.mozilla.org/integration/gaia-central/rev/e32c9256beb4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #14861 from KevinGrandon/bug_952158_rocketbar_add_clear_button

Bug 952158 - [Rocketbar] Add clear button r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/4ebc5e0da6fe
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 952158 - [Rocketbar] Add clear button r=vingtetun