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

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https://hg.mozilla.org/integration/gaia-1_4/rev/15e1c3d1b489
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #18164 from wilsonpage/992341

Bug 992341 - [B2G][Camera] Double tapping in camera causes self-timer to

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https://hg.mozilla.org/integration/gaia-1_4/rev/d617acb1aab3
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #18190 from justindarc/bug991367

Bug 991367 - [B2G][Gallery] The Camera button remains active beneath the...

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https://hg.mozilla.org/integration/gaia-1_4/rev/a3eab6302c94
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #18134 from justindarc/bug993043

Bug 993043 - [Camera][Buri] viewfinder stays zoomed in and doesn't resto...

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https://hg.mozilla.org/integration/gaia-1_4/rev/7ce9ce4f79a4
Author: lissyx <lissyx+github@lissyx.dyndns.org>
Desc: Merge pull request #17986 from lissyx/bug992129

Bug 992129 - Generate voicemail notifications that are DSDS compliants r=etienne_s

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https://hg.mozilla.org/integration/gaia-1_4/rev/d1139aa07e0b
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #18004 from EverythingMe/992644-console-binding

Bug 992644 - EverythingME.log: Bind to window.console object [r=ranbena]
Bumping manifests a=b2g-bump