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

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https://hg.mozilla.org/integration/gaia-central/rev/c66e28d90b45
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25122 from wilsonpage/1082135

Bug 1082135 - [HomeScreen] Edit header button is the wrong color r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/896e4146d55b
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1082135 - [HomeScreen] Edit header button is the wrong color

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https://hg.mozilla.org/integration/gaia-central/rev/ef13ec8c4be7
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #25095 from millermedeiros/1081050-intermittent-day-observer-test

Bug 1081050 - Intermittent calendar/test/unit/day_observer_test.js | "after each" hook - TypeError: this.connection is null (app://calendar.gaiamobile.org/js/db.js?time=1412932298308:155) r=gaye

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https://hg.mozilla.org/integration/gaia-central/rev/3ef8ec9b303c
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Bug 1081050 - Intermittent calendar/test/unit/day_observer_test.js | "after each" hook - TypeError: this.connection is null (app://calendar.gaiamobile.org/js/db.js?time=1412932298308:155)
Bumping manifests a=b2g-bump