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

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https://hg.mozilla.org/integration/gaia-central/rev/62c0ad5b88f1
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #14519 from lightsofapollo/s3-uploads

Bug 948177 - Setup Travis S3 bucket / artifact configuration +shepherd

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https://hg.mozilla.org/integration/gaia-central/rev/a0b719d1599c
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 948177 - Setup Travis S3 bucket / artifact configuration