Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/c90b68bf3c30
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #31273 from nullaus/bug1174901

Bug 1174901 - Use mocha 2.x instead of 1.20. r=gaye

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https://hg.mozilla.org/integration/gaia-central/rev/a219e1701d92
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: Bug 1174901 - Update to mocha 2. r=eli

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https://hg.mozilla.org/integration/gaia-central/rev/fdea280d2adf
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #33431 from nullaus/master

Bug 1228205 - Publish new marionette-client. r=eli

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https://hg.mozilla.org/integration/gaia-central/rev/5c91402917da
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: Bug 1228205 - Publish new marionette-client. r=eli

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "1827409ed1a9ca8686e41abce0c4f14e88c691f4", 
+        "git_revision": "6d66a9eff9fd33fafc97bc75753558969de48cc3", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "74dd09dd2ae84fb15991161bc3335251b02e67c2", 
+    "revision": "c90b68bf3c30023a1abefb2bc20383e40b16cafc", 
     "repo_path": "integration/gaia-central"
 }