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

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https://hg.mozilla.org/integration/gaia-central/rev/b95a2c8fc80f
Author: Jim Porter <squibblyflabbetydoo@gmail.com>
Desc: Merge pull request #16496 from jimporter/ringtone-pick

Bug 953093 - [Fugu][File upload selector] Choosing the system ringtones will go back to the webpage; r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/8dce724d6a03
Author: Jim Porter <jporter@mozilla.com>
Desc: Bug 953093 - [Fugu][File upload selector] Choosing the system ringtones will go back to the webpage

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https://hg.mozilla.org/integration/gaia-central/rev/47dfc9bf15d5
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #16464 from jrburke/bug974292-email-done-blank

Bug 974292 - [Email][V1.3&V1.4] Tapping the Done button of mail settings page redirects to a blank page r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/4a8c4d15f11e
Author: jrburke <jrburke@gmail.com>
Desc: Bug 974292 - [Email][V1.3&V1.4] Tapping the Done button of mail settings page redirects to a blank page
Bumping manifests a=b2g-bump