Bumping gaia.json for 4 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/d57c96a89bf0
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #14081 from bobsilverberg/eme_search

Bug 935915 - Change test_everything_me_search for a more generic search term

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https://hg.mozilla.org/integration/gaia-1_2/rev/56673f59b3b1
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 935915 - Change test_everything_me_search for a more generic search term
Uplift for v1.2

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https://hg.mozilla.org/integration/gaia-1_2/rev/0ba7a6e551f0
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #14082 from bobsilverberg/cp4a66557

Bug 930532 - Python use self.apps.displayed_app in Gallery app object

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https://hg.mozilla.org/integration/gaia-1_2/rev/961fa142b10e
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 930532 - Python use self.apps.displayed_app in Gallery app object