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/aa1ce78ca906
Author: AndreiH <andrei.hutusoru@gmail.com>
Desc: Merge pull request #13803 from AlinT/unxfail_email_tests

Bug 939836 - Unxfail test_send_imap_email & test_send_active_sync_email

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https://hg.mozilla.org/integration/gaia-1_2/rev/49c22c86d42d
Author: AlinT <trifandreialin@gmail.com>
Desc: Bug 939836 - Unxfail test_send_imap_email & test_send_active_sync_email