Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/4e82991755f8
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #20767 from KevinGrandon/bug_1027144_ui_test

Bug 1027144 - Re-enable test_homescreen_move_app.py

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https://hg.mozilla.org/integration/gaia-central/rev/f04b703bf5ed
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1027144 - Re-enable test_homescreen_move_app.py
Bumping manifests a=b2g-bump