Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/df751d978e54
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #13976 from aniruddha-adhikary/master

Bug 842592: Adding Bangla Input Method for B2G.
r=rudylu(cherry picked from commit 47161c8a657c25ee7b29c84ce3b4e4df191c09a0)
a=timdream

Conflicts:
	.jshintignore