Bumping gaia.json for 2 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/4a530f94360b
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #15784 from nullaus/bug963322

bug 963322

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https://hg.mozilla.org/integration/gaia-1_3/rev/d2eb4d583109
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 963322

* uri decode the message before setting it as text content.
* this is only required for 1.3 as 1.4 and greater uses the URL object which automatically does this for us.

r=mhenretty