Bumping gaia.json for 3 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/ffe47e2d96de
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 903400 - Trim whitespaces for search in the e.me search bar. r=vingtetun,a=leo+

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https://hg.mozilla.org/integration/gaia-central/rev/44c09c38ef4b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #11448 from KevinGrandon/bug_902959_add_getApps_param

Bug 902959 - Add option to suppress apps which have hidden roles r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/7bac1ccb3ef5
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 902959 - Add option to suppress apps which have hidden roles

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "b89cd693bf171b30fa59089108a71a3305921886", 
+    "revision": "ffe47e2d96de20d80111f70a0ed67c0898583484", 
     "repo_path": "/integration/gaia-central"
 }