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

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https://hg.mozilla.org/integration/gaia-central/rev/3e18cbfa2960
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #18868 from staktrace/flashfix

Bug 1004505 - Avoid double-quoting variables, resulting in invalid JSON,  r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/0b18a3b9bb84
Author: Kartikaya Gupta <kgupta@mozilla.com>
Desc: Bug 1004505 - Avoid double-quoting variables, resulting in invalid JSON. r=timdream
Bumping manifests a=b2g-bump