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

========

https://hg.mozilla.org/integration/gaia-central/rev/78ec375c2b2d
Author: Fabien Cazenave <fabien@mozilla.com>
Desc: Merge pull request #16613 from Pike/bug-976190-add-Lithuanian

bug 976190, add Lithuanian (lt), f=rq, r=kaze

========

https://hg.mozilla.org/integration/gaia-central/rev/4ba2e600486a
Author: Axel Hecht <axel@pike.org>
Desc: bug 976190, add Lithuanian (lt), f=rq, r=kaze

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "823616f0af83eca32bceb0367a7a221f8b187110", 
+    "revision": "78ec375c2b2df11693c84ed732a863d57245f3f1", 
     "repo_path": "/integration/gaia-central"
 }