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

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https://hg.mozilla.org/integration/gaia-central/rev/2e42bc57d96c
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #12981 from wanderview/contacts-delete-search

Bug 928939: Check to see if contacts.Search is loaded in delete path.  r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/1c76e1fcb4e9
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 928939: Check to see if contacts.Search is loaded in delete path.

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https://hg.mozilla.org/integration/gaia-central/rev/e3bfdfdfd6b5
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #12977 from wanderview/contacts-edit-defobj

Bug 928922: Handle null value in contacts edit screen. r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/d8eb91dc37e4
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 928922: Handle null value in contacts edit screen
Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/216a751e109b
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #12962 from reubenmorais/more-webidl-fixes

Bug 928635 - Fix handling of array properties in the New Contact form.  r=wanderview

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https://hg.mozilla.org/integration/gaia-central/rev/0f06b2e962b6
Author: Reuben Morais <reuben.morais@gmail.com>
Desc: Bug 928635 - Fix handling of array properties in the New Contact form. r=bkelly