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

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https://hg.mozilla.org/integration/gaia-central/rev/04a42c857f3d
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #15179 from pivanov/bug-947099-followup-2

follow up patch for Bug 947099 - [Dialer]

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https://hg.mozilla.org/integration/gaia-central/rev/0e89a77fe081
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: follow up patch for Bug 947099 - [Dialer]

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https://hg.mozilla.org/integration/gaia-central/rev/24347af51f8d
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #15177 from pivanov/bug-947094-followup

follow up patch for Bug 947094 - [Calendar]

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https://hg.mozilla.org/integration/gaia-central/rev/429aaf5fb3ed
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: follow up patch for Bug 947094 - [Calendar]