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

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https://hg.mozilla.org/integration/gaia-central/rev/1317acf816b4
Author: evelynhung <jj.evelyn@gmail.com>
Desc: Merge pull request #15930 from svic/Bug_964672

Bug 964672 - Don't call Pair() before sendFile() otherwise pairing dialog will be shown, r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/991fefc5b1e3
Author: Arno Puder <arno@puder.org>
Desc: Bug 964672 - Don't call Pair() before sendFile() r=evelyn
Bumping manifests a=b2g-bump