Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/94d3b8bbcc10
Author: Dave Hylands <dhylands@gmail.com>
Desc: Bug 1059484 - Enable sharing on the external storage card called sdcard1. r=arthur.chen

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https://hg.mozilla.org/integration/gaia-2_1/rev/47eb9d847f25
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1063568 - Removing overlap with 1 sim

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https://hg.mozilla.org/integration/gaia-2_1/rev/af081d2915ac
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1067303 - [Contacts] deferred actions / migrator is not working. errors in console are found
Bumping manifests a=b2g-bump