Bumping manifests a=b2g-bump
Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/e0dcffc9ca60
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 988760 - Workaround for glitchy sound when playing the busytone r=etienne

(cherry picked from commit d3a918483a7342052ede64bcb5dc6c72f5356212)

Conflicts:
	build/jshint/xfail.list
Bumping manifests a=b2g-bump
Merge b2g28 to v1.3t. a=merge