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

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https://hg.mozilla.org/integration/gaia-central/rev/2ee76f2dca4a
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #17635 from viorelaioia/bug_986531

Bug 986531 - Xfail test_sms_with_attachments due to Bug 987809

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https://hg.mozilla.org/integration/gaia-central/rev/98769c29e5a4
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 986531 - Xfail test_sms_with_attachments due to Bug 987809

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https://hg.mozilla.org/integration/gaia-central/rev/69fdb5d342f6
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #17634 from yurenju/stage-windows-squash-2

Bug 897352 - [gaia build system] Transition to a build_stage for assembl...

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https://hg.mozilla.org/integration/gaia-central/rev/b23875db386f
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 897352 - [gaia build system] Transition to a build_stage for assembling apps

Conflicts:
	Makefile
	apps/communications/build/build.js
	build/copy-build-stage-manifest.js
	build/test/integration/distribution.test.js
	build/utils-xpc.js
	build/utils.js
	build/webapp-manifests.js
Bumping manifests a=b2g-bump