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

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https://hg.mozilla.org/integration/gaia-central/rev/9ade1131290c
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #12384 from yurenju/reduce-size

Bug 917144 - remove some apps to reduce image size

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https://hg.mozilla.org/integration/gaia-central/rev/db6e3683de4a
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 917144 - remove some apps to reduce image size

remove apps list below to reduce image size for engineering build:
- cubevid
- testpermission
- image-uploader
- crystalskull
- test-ime
- tests-sensors