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

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https://hg.mozilla.org/integration/gaia-central/rev/475e62c58cdb
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #15583 from mcav/pop3-conn-drop

[B2G][Email] POP3 account creation hangs when an incorrect password is used with a POP3 server that immediately disconnects on incorrect password (ex: aol.com POP3 server). r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/d05c7c511efc
Author: Marcus Cavanaugh <m@mcav.com>
Desc: [B2G][Email] POP3 account creation hangs when an incorrect password is used with a POP3 server that immediately disconnects on incorrect password (ex: aol.com POP3 server). r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/11d8c21e18ec
Author: Corey Frang <gnarf37@gmail.com>
Desc: Bug 937431 - [Tooling] make jshint a requirement on pre-commit r=rik

* changes how `make lint` works
* introduces a jshint-blacklisted reporter
* changes the pre-commit hook to run both jshint and gjslint
* changes the linters Travis jobs
* remove all predefined globals from the main .jshintrc default global
* add new jshintrc files for subdirectories
* add a README file in build/jshint/
Bumping manifests a=b2g-bump