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

========

https://hg.mozilla.org/integration/gaia-central/rev/91090f417a67
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #11598 from yurenju/900504

Bug 900504 - added new argument --gaia to get correct l10n r=stas

========

https://hg.mozilla.org/integration/gaia-central/rev/a3097d0cc6ce
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 900504 - added new argument --gaia to get correct l10n