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

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https://hg.mozilla.org/integration/gaia-central/rev/e50980bce865
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1147759 - merge pull request #29164 from sean2449:Bug_1147759_thumnail to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/5415a282d666
Author: Sung Chiu <suchiu@mozilla.com>
Desc: Bug 1147759 - [Stingray] Fix typo from thumnail to thumbnail in deserialize function of Application.js

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "4bb3a933bd805e8df1e11827cb247754c3565b0b", 
+        "git_revision": "df618b95f515bd0135daa8d9936ebdaaee828b8d", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "00266dd4a8170bfe9208338a1ecafbef0bb53306", 
+    "revision": "e50980bce865c66bd1a600e5b291c34fc9be8de1", 
     "repo_path": "integration/gaia-central"
 }