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

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https://hg.mozilla.org/integration/gaia-central/rev/0c84914972be
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #13420 from timdream/keyboard-bulgarian

Bug 932606 - Bulgarian Keyboard, r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/e29fa27fd1cf
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 932606 - Bulgarian Keyboard