Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/020bf0df084e
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Merge pull request #16755 from qdot/978364-fix-ftu-tests

978364 fix ftu tests

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https://hg.mozilla.org/integration/gaia-central/rev/bb11e2a9fb86
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Bug 978364 - Move FTU Tests to correct filename scheme

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https://hg.mozilla.org/integration/gaia-central/rev/20c00f5bf6c3
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Bug 978364 - Fix missing helper call in FTU integration tests

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https://hg.mozilla.org/integration/gaia-central/rev/d021424e69bf
Author: Jan Keromnes <janx@linux.com>
Desc: Merge pull request #16748 from jankeromnes/target

Bug 978058 - Make Firefox OS' devtools track frames instead of manifests. r=21

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https://hg.mozilla.org/integration/gaia-central/rev/ae27845e0f86
Author: Jan Keromnes <janx@linux.com>
Desc: Bug 978058 - Make Firefox OS' devtools track frames instead of app manifests. r=vingtetun
Bumping manifests a=b2g-bump