Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/59298db915cd
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #31772 from nullaus/bug1199429

Bug 1199429 - Run Gaia tests with Mulet. Update to tutorial to fix test failure.

========

https://hg.mozilla.org/integration/gaia-central/rev/834fc982a619
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: Bug 1199429 - Update FTU tutorial, test so it runs in Mulet. r=me

========

https://hg.mozilla.org/integration/gaia-central/rev/d9af7832b0cf
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: Bug 1199429 - Use Mulet for all Gaia tests. r=me

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "f31271145b6bd25da189714a1f760c5602876db5", 
+        "git_revision": "0a552a2157559fdba67a25421ea94eff38bce593", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "bd8b3d47de8bdb4e8450a1db893ab646b301387c", 
+    "revision": "59298db915cde300c6784a4ce995c80e0560c68d", 
     "repo_path": "integration/gaia-central"
 }