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

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https://hg.mozilla.org/integration/gaia-central/rev/c430db44d7df
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #19740 from jrburke/bug950208-email-2.0-visual-refresh

Bug 950208 - [meta] Email Visual Refresh r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/26ab46849e94
Author: jrburke <jrburke@gmail.com>
Desc: Bug 950208 - [meta] Email Visual Refresh

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https://hg.mozilla.org/integration/gaia-central/rev/7de5170c7f19
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19723 from KevinGrandon/bug_971552_system2_sleep_menu

Bug 971552 - [System2] Instantiable SleepMenu r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/e6024ba99123
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 971552 - [System2] Instantiable SleepMenu r=alive
Bumping manifests a=b2g-bump