Bumping gaia.json for 5 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/64f56904ff4a
Author: gasolin <gasolin@gmail.com>
Desc: Revert "Merge pull request #14556 from MBRSL/bug-931655-fm"

This reverts commit 1f6e2e53cc2b41e8008a7905c72eb20fc3af52c4, reversing
changes made to 9cfc5da54cc69a8d700f1e5267759878be88fd69.

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https://hg.mozilla.org/integration/gaia-central/rev/2d2a95169bac
Author: Jose Antonio Olivera Ortega <josea.olivera@gmail.com>
Desc: Merge pull request #15066 from jaoo/951436

Bug 951436 - [B2G][WAP Push][Notification][Settings] APN settings are not stored in settings once received. r=gsvelto

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https://hg.mozilla.org/integration/gaia-central/rev/b1280997dbd6
Author: Jose Antonio Olivera Ortega <josea.olivera@gmail.com>
Desc: Bug 951436 - [B2G][WAP Push][Notification][Settings] APN settings are not stored in settings once received

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https://hg.mozilla.org/integration/gaia-central/rev/a26ec17a7c99
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #15045 from steveck-chung/bug-941852

Bug 941852 - [B2G]Long pressing MMS attachments will cause alternate message to appear and overlap. r=julienw, a=blocking-b2g 1.3+

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https://hg.mozilla.org/integration/gaia-central/rev/ce419b562f63
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 941852 - [B2G]Long pressing MMS attachments will cause alternate message to appear and overlap