Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/a114749868c7
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #13562 from dmarcos/bug931054v1.2

Bug 931093 - [Camera] Update app to specify suitable thumbnailSize

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https://hg.mozilla.org/integration/gaia-1_2/rev/f04e4300cace
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 931093 - [Camera] Update app to specify suitable thumbnailSize