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

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https://hg.mozilla.org/integration/gaia-central/rev/d3806f36e35b
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #14129 from viorelaioia/bug_943865

Bug 943865 - Increase timeout in wait_for_filmstrip_not_visible

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https://hg.mozilla.org/integration/gaia-central/rev/cc562104ef61
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 943865 - Increase timeout in wait_for_filmstrip_not_visible

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https://hg.mozilla.org/integration/gaia-central/rev/d87407accc47
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #14219 from zacc/bug_940295

Bug 940295 - Refactor test_calendar_new_event to use default date values...

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https://hg.mozilla.org/integration/gaia-central/rev/e34061fe1787
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 940295 - Refactor test_calendar_new_event to use default date values. Also clean up calendar app locators