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

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https://hg.mozilla.org/integration/gaia-central/rev/c394f80eb2bb
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #13874 from jmcanterafonseca/fb_favs_link_img

Bug 937205 - [B2G][Contacts] Contact picture does not display after Link...

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https://hg.mozilla.org/integration/gaia-central/rev/0b86a074dd7b
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 937205 - [B2G][Contacts] Contact picture does not display after Linking and Favoriting a Facebook contact