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

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https://hg.mozilla.org/integration/gaia-central/rev/4026943dda93
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #15444 from dmarcos/bug959890

Bug 959890 - [Camera] Refactor Regression - Camera doesn't have a full s...

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https://hg.mozilla.org/integration/gaia-central/rev/2f8157b49f5c
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 959890 - [Camera] Refactor Regression - Camera doesn't have a full screen viewfinder

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https://hg.mozilla.org/integration/gaia-central/rev/0f6c19d6083d
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 960133 - Test urls against a local running server. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/7ab1c0788ec7
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 952098 - Add places as a rocketbar provider. r=kgrandon
Bumping manifests a=b2g-bump