Bumping gaia.json for 4 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/794addcf08c6
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #13424 from yxl/remove-keyboard-extension

Bug 932151 - Get rid of keyboard@gaiamobile.org extension. r=fabrice

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https://hg.mozilla.org/integration/gaia-central/rev/65dc6b36b9aa
Author: Yuan Xulei(袁徐磊) <xyuan@mozilla.com>
Desc: Bug 932151 - Get rid of keyboard@gaiamobile.org extension. r=fabrice

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https://hg.mozilla.org/integration/gaia-central/rev/383372f13dec
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #13493 from masap/20131108

Bug 936267 - [System][Internet Sharing] Fix error on no SIM device

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https://hg.mozilla.org/integration/gaia-central/rev/e88ed1cc5d8b
Author: masap <masashi.honma@gmail.com>
Desc: Bug 936267 - [System][Internet Sharing] Fix error on no SIM device