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

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https://hg.mozilla.org/integration/gaia-central/rev/cf6a15f55a94
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #17732 from KevinGrandon/bug_988034_system_multiple_action_menus

Bug 988034 - Double clicking on wallpaper activity causes activity menu to reappear r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/ed82eadd15b3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 988034 - Double clicking on wallpaper activity causes activity menu to reappear r=alive
Bumping manifests a=b2g-bump