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

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https://hg.mozilla.org/integration/gaia-central/rev/f1f382b8820e
Author: lissyx <lissyx+github@lissyx.dyndns.org>
Desc: Merge pull request #20757 from lissyx/bug1017821

Bug 1017821 - Cleanup voicemail notifications on start r=etienne_s

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https://hg.mozilla.org/integration/gaia-central/rev/0f1b41567f53
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 1017821 - Cleanup voicemail notifications on start r=etienne_s

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https://hg.mozilla.org/integration/gaia-central/rev/caceaa30fb87
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #20958 from yurenju/findmydevice

Bug 1029959 - remove Makefile of findmydevice r=@cctuan

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https://hg.mozilla.org/integration/gaia-central/rev/c750f8b8c42c
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 1029959 - remove Makefile of findmydevice
Bumping manifests a=b2g-bump