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

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https://hg.mozilla.org/integration/gaia-central/rev/ed215858b4da
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #12871 from bobsilverberg/sms_contact

Bug 926944 - Add a recipient to an SMS using the Contacts app, r=zac

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https://hg.mozilla.org/integration/gaia-central/rev/bff431bfd59e
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 926944 - Add a recipient to an SMS using the Contacts app, r=zac

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https://hg.mozilla.org/integration/gaia-central/rev/2f118e2773d9
Author: lissyx <lissyx+github@lissyx.dyndns.org>
Desc: Merge pull request #12912 from lissyx/bug906296-v2

Bug 906296 - Ensure that settings from range value are Numbers r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/c49e0b7b0441
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 906296 - Ensure that settings from range value are Numbers

When storing the settings that comes from a range input, we do some
rounding using toFixed(). Unfortunately, toFixed() returns a String.
Changes in the Gecko handling of some of the settings (namely, audio
policy) makes usage of String impossible and we need to ensure that we
pass some Number. We thus change the code to perform a supplementary
parseFloat() after toFixed() to ensure this.