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

========

https://hg.mozilla.org/integration/gaia-central/rev/2e20229ca3de
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1128883 - merge pull request #28374 from jrburke:bug1128883-email-activesync-infer-junk-folder to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/a3492dc290f8
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1128883 - [email/activesync] Infer junk folder type from folder name

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https://hg.mozilla.org/integration/gaia-central/rev/212babd6ec69
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1118893 - merge pull request #27865 from jrburke:bug1118893-email-list-carat to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/abad2f894b36
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1118893 - [RTL][Email] Carats in list items

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "27f587636c4bc9c38e24fc3ed30fc61654b103bc", 
+        "git_revision": "fea218be41330d86dc77fa99d3abc7c65e91df6f", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "4ff3e49849b09ddd0f8ad194ac3c5771003be1ab", 
+    "revision": "2e20229ca3deb7205a4d1899d9f2191218dba024", 
     "repo_path": "integration/gaia-central"
 }