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

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https://hg.mozilla.org/integration/gaia-central/rev/290a7bab1eb3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1022971 - Rename Icon grid object to Mozapp r=lightsofapollo

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https://hg.mozilla.org/integration/gaia-central/rev/64927ac9acff
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1022971 - Rename Icon grid object to Mozapp r=lightsofapollo"

This reverts commit 78ec7950484ab07867d97dd565df1f0424fa05da.
Bumping manifests a=b2g-bump