Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/a4ef800576e5
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #14704 from KevinGrandon/bug_826274_annoying_sound

Bug 826274 - Disabled lock screen sound still plays r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/221a6c457f11
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 826274 - Disabled lock screen sound still plays
Merge mozilla-central to b2g-inbound
Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/2cadc5d69c72
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Merge pull request #14752 from gregorwagner/back

Travis bustage fix.

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https://hg.mozilla.org/integration/gaia-central/rev/9005e1961498
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Travis bustage fix
Bug 901457 - [sms][mms] We need a property for the "sent" timestamp (part 1, IDL changes). sr=sicking f=vicamo
Bug 901457 - [sms][mms] We need a property for the "sent" timestamp (part 2, implementation). r=vicamo
Bug 786347 - Fix <a ping> implementation to follow spec r=bz

From ecd12f2127c5b21e78fdb937e8feb7de1da53023 Mon Sep 17 00:00:00 2001
Bug 786347 - Tests for <a ping> implementation r=bz

From 0023364806ae433e55d42a915a9d47e2f18df558 Mon Sep 17 00:00:00 2001
no bug - Add Missing namespace. r=jonco
Bug 950722 - Add a test for interaction between WeakMap and moving GC r=terrence
Bug 950617 - Fix test code to not assume existence of TypedObject r=sfink
Bug 928378 - Add description of post-barriers r=billm
Bug 930427 - Don't allow merge of debugger-visible compartments r=billm
Bug 848842 - Stop using heuristic detection in the File API. r=bzbarsky.
Bug 949345 - Gather telemetry about non-default Cyrillic legacy encodings. r=emk,f=sstamm.
Bug 945216 - Fixed mozglue/ compilation on mingw. r=glandium
Bug 943870 - Constify aDataBuff in CreatePrimitiveForData. r=ehsan
Bug 949821 - Use L... for wchar_t* strings.
Bug 945292 - Makefile.in part. r=glandium
Merge mozilla-central to mozilla-inbound
Bug 935375 - Word offsets broken if the next word is an embedded object, r=tbsaunde