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

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https://hg.mozilla.org/integration/gaia-central/rev/e8149d923d9c
Author: crdlc <crdlc@tid.es>
Desc: Bug 1016822 - [Vertical Homescreen] Implement the RocketBar & status bar visuals properly

Includes follow-up fix in bug 1018147.

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https://hg.mozilla.org/integration/gaia-central/rev/c75408ac99ed
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1016822 - [Vertical Homescreen] Implement the RocketBar & status bar visuals properly"

This reverts commit fc0e994c2be749e6b279a90c9ac178db82c37a9b.
Bumping manifests a=b2g-bump