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

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https://hg.mozilla.org/integration/gaia-central/rev/c46437a69b3a
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #12028 from lissyx/bug907757

Bug 907757 - Give better error message for missing phone and email

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https://hg.mozilla.org/integration/gaia-central/rev/5e77986ddff8
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 907757 - Give better error message for missing phone and email

When we pick a contact, we cannot filter whether they have an email or a
phone number, depending on the pick request. This might make the user
pick contacts that are invalid in this case. So we notify this with an
alert. This commit ensure that we bring better error messages in this
case.

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https://hg.mozilla.org/integration/gaia-central/rev/841bf8f3ab03
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #11499 from jrburke/bug892519-email-bg-notify

Bug 892519 - [email] Notifications - Email App Not Foreground r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/ddcb15818be2
Author: jrburke <jrburke@gmail.com>
Desc: Bug 892519 - [email] Notifications - Email App Not Foreground