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

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https://hg.mozilla.org/integration/gaia-central/rev/0683a47a69b7
Author: ochameau <poirot.alex@gmail.com>
Desc: Merge pull request #18775 from ochameau/settings

Bug 999475 - Allows overloading SETTINGS_PATH with env variable r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/cee8cd395ad5
Author: Alexandre Poirot <poirot.alex@gmail.com>
Desc: Bug 999475 - Allows overloading SETTINGS_PATH with env variable. r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/13532f804d84
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #18770 from evanxd/bug-951084

Bug 951084 - Keep the same color of tab items on :active status.

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https://hg.mozilla.org/integration/gaia-central/rev/19b5b8fd09fa
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 951084 - Keep the same color in origin and :active status for tab items.
Bumping manifests a=b2g-bump