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

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https://hg.mozilla.org/integration/gaia-central/rev/5b02a614c6ee
Author: Corey Frang <gnarf37@gmail.com>
Desc: Bug 909622 - [B2G][Helix][messages][zhaotao]Sending mms with attachment(chinese name mp3) fail - r=julienw

- Replace all non standard word characters in filenames with a # while encoding SMIL
- Remove HTML escaping in preference for replacing unsafe chars with the #
- Add unit test to ensure that quotes are always escaped