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

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https://hg.mozilla.org/integration/gaia-central/rev/6001dbedd36f
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 1063685 - Add getAppByURL to the AppWindowManager. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/d95703e7accb
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1054989 - [Messages][DSDS] Send button refresh r=azasypkin
Bumping manifests a=b2g-bump