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

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https://hg.mozilla.org/integration/gaia-2_0/rev/77efd5a8abc6
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Empty commit to trigger the build

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https://hg.mozilla.org/integration/gaia-2_0/rev/60ca0f1b2c1b
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 1030094 - Fix bustage; check if we have mozL10n for tests. r=ryanvm
Bumping manifests a=b2g-bump