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/718c9ccb7435
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #12795 from teodosia/eme-updates

Bug 925370 - Update e.me app on aurora

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https://hg.mozilla.org/integration/gaia-1_2/rev/a5b839c11d9a
Author: Teodosia Pop <teodosia.pop@gmail.com>
Desc: Bug 925370 - Update e.me app on aurora