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

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https://hg.mozilla.org/integration/gaia-central/rev/e9f23d196a51
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #25633 from gaye/bug-1088813

Bug 1088813 - Calendar sending notifications with 'null' as body r=millermedeiros

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https://hg.mozilla.org/integration/gaia-central/rev/4c089b2951ff
Author: gaye <gaye@mozilla.com>
Desc: 1088813 - Calendar sending notifications with 'null' as body

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https://hg.mozilla.org/integration/gaia-central/rev/14506fa13fdc
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #25893 from wilsonpage/1090501

Bug 1090501 - Remove 'busy'/'ready' event firing from previewStateChange event

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https://hg.mozilla.org/integration/gaia-central/rev/7885f3ffcbfb
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1090501 - Remove 'busy'/'ready' event firing from previewStateChange event
Bumping manifests a=b2g-bump