Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/042ee12cec91
Author: Salvador de la Puente <salva@unoyunodiez.com>
Desc: Carmen made a mistake and this merge is invalid. See the bug in bugzilla for
more info. Reverting.

Revert "Merge pull request #16048 from mcjimenez/bug923449"

This reverts commit 3b0bc1c5dbd09cdb84dfa492b49dc3403b945020, reversing
changes made to fdea06af4276c37cb83fdd4cd3c551be7109bef1.
Bumping manifests a=b2g-bump
Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/500d57309898
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #15990 from etiennesegonzac/contact-thumbnails

Bug 967272 - Introducing contact photo thumbnails for new contacts,
and using thumbnails wherever it makes sense.
r=arcturus, jmcf(facebook), julienw(sms), rik(dialer)

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https://hg.mozilla.org/integration/gaia-central/rev/6c4783a162d4
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 967272 - Introducing contact photo thumbnails for new contacts,
and using thumbnails wherever it makes sense.
r=arcturus, jmcf(facebook), julienw(sms), rik(dialer)
Bumping manifests a=b2g-bump