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

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https://hg.mozilla.org/integration/gaia-central/rev/16c5d5230641
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #14552 from askeing/948799

Bug 948799 - Xfail test_cost_control_reset_wifi.py

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https://hg.mozilla.org/integration/gaia-central/rev/b19a6bc94631
Author: askeing <askeing@gmail.com>
Desc: Bug 948799 - Xfail test_cost_control_reset_wifi.py

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https://hg.mozilla.org/integration/gaia-central/rev/b82cbbf5cb94
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #14562 from askeing/948842

Bug 948842 - Re-enable test_sms_with_attachments.py

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https://hg.mozilla.org/integration/gaia-central/rev/7c6acd83dd4c
Author: askeing <askeing@gmail.com>
Desc: Bug 948842 - Re-enable test_sms_with_attachments.py