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

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https://hg.mozilla.org/integration/gaia-1_4/rev/15501fd47b9a
Author: AndreiH <andrei.hutusoru@softvision.ro>
Desc: Merge pull request #19587 from viorelaioia/bug_976028_v1.4

[v1.4] Bug 976028 - test_play_ogg_video failing with libEGL.so loads twice

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https://hg.mozilla.org/integration/gaia-1_4/rev/36d36974e50d
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 976028 - test_play_ogg_video failing with libEGL.so loads twice
Bumping manifests a=b2g-bump