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

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https://hg.mozilla.org/integration/gaia-central/rev/aec41eed665d
Author: Mike Habicher <mikeh@mozilla.com>
Desc: Merge pull request #26612 from wilsonpage/1104055

Bug 1104055 - Use promises instead of callbacks

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https://hg.mozilla.org/integration/gaia-central/rev/af47a8beae64
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1104055 - Use promises instead of callbacks

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https://hg.mozilla.org/integration/gaia-central/rev/031026f33c84
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1107665 - test_marketplace_launch.py should be external=true a=test-only r=me

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https://hg.mozilla.org/integration/gaia-central/rev/7b9a3680fefe
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1104991 - Update autolander repo link
Bumping manifests a=b2g-bump