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

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https://hg.mozilla.org/integration/gaia-2_0/rev/193507c013ce
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bump gaiatest-v2.0 version to 0.4. a=test-only

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https://hg.mozilla.org/integration/gaia-2_0/rev/fcf2d60dd3bb
Author: Andrei Hutusoru <andrei.hutusoru@softvision.ro>
Desc: Bug 1059224 - Update launch method with manifest_url option. r=dhunt r=bsilverberg a=test-only
Bumping manifests a=b2g-bump