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

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https://hg.mozilla.org/integration/gaia-central/rev/013941a1c5ac
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #14344 from cctuan/946107

Bug 946107 - add build tests in travis

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https://hg.mozilla.org/integration/gaia-central/rev/f4908d64a17b
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 946107 - add build tests in travis