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

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https://hg.mozilla.org/integration/gaia-central/rev/a93e62a5f6cd
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #14159 from crh0716/930222

Bug 930222 - Use mdn on cdma devices r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/98ac97843fb2
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 930222 - Use mdn on cdma devices

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https://hg.mozilla.org/integration/gaia-central/rev/d281552c118a
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #14196 from askeing/944570

Bug 944570 - Xfail test_sms_to_dialer.py

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https://hg.mozilla.org/integration/gaia-central/rev/e66911e74aae
Author: askeing <askeing@gmail.com>
Desc: Bug 944570 - Xfail test_sms_to_dialer.py