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

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https://hg.mozilla.org/integration/gaia-central/rev/5960f9707236
Author: lissyx <lissyx+github@lissyx.dyndns.org>
Desc: Merge pull request #15039 from lissyx/bug938540

Bug 938540 - Use Notification API for WapPush r=gsvelto

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https://hg.mozilla.org/integration/gaia-central/rev/bf83ac9001a7
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 938540 - Use Notification API for WapPush
Bumping manifests a=b2g-bump