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

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https://hg.mozilla.org/integration/gaia-central/rev/3e612bc9b3d7
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #21458 from asutherland/bug1035241

Bug 1035241 - Update mail-fakeservers to 0.0.19 to enable gaia XULRunner upgrade to version 33. r=kgrandon r=squib

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https://hg.mozilla.org/integration/gaia-central/rev/d72008480d66
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Bug 1035241 - Update mail-fakeservers to 0.0.19 to enable gaia XULRunner upgrade to version 33.
Bumping manifests a=b2g-bump