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

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https://hg.mozilla.org/integration/gaia-1_3/rev/ecb773a7cbd0
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #17947 from AndreiH/bug_991679

Bug 991679 - [v1.3] Investigate and try to fix test_ftu_skip_tour.TestFt...

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https://hg.mozilla.org/integration/gaia-1_3/rev/223542fe4362
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 991679 - [v1.3] Investigate and try to fix test_ftu_skip_tour.TestFtu fails on v1.3

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https://hg.mozilla.org/integration/gaia-1_3/rev/c5ba481e687e
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #17945 from AndreiH/bug_991597

Bug 991597 - [v1.3] Fix test_settings_wifi.TestSettingsWifi on v1.3

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https://hg.mozilla.org/integration/gaia-1_3/rev/6ef2e7df8806
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 991597 - [v1.3] Fix test_settings_wifi.TestSettingsWifi on v1.3
Bumping manifests a=b2g-bump