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

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https://hg.mozilla.org/integration/gaia-central/rev/13fba23da899
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #27967 from julienw/remove-text-at-loading

Bug 1129913 - Remove all text in markup for gaia-header > h1 nodes r=

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https://hg.mozilla.org/integration/gaia-central/rev/87c09f6003bc
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1129913 - Remove all text in markup for gaia-header > h1 nodes r=iliu,mmedeiros,francisco,salva,sfoster,pdahiya,dkuo,arthurcc,schung,alive,johnhu,gsvelto

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "c568fb4e6732788c835c236147d34a6b02ca9bb7", 
+        "git_revision": "0cf517083f7eb5fc269e1236edba50534f65e3cd", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "a73fb25434e8e630aa1136ee09dd5603faf8b24f", 
+    "revision": "13fba23da899bce302aa98aaf4a429eb52fb341b", 
     "repo_path": "integration/gaia-central"
 }