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

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https://hg.mozilla.org/integration/gaia-central/rev/e61a89d66457
Author: RickyChien <ricky060709@gmail.com>
Desc: Merge pull request #19704 from RickyChien/bug-1006357

Bug 1006357 - make test agent to run tests from all apps locally and in travis r=@yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/f996b37c865b
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Bug 1006357 - make test agent to run tests from all apps locally and in travis

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "e99888b85a6b01d8fcd322b27d7d282647e92857", 
+    "revision": "e61a89d6645766bf555c327cebc7d0f8cee24dda", 
     "repo_path": "/integration/gaia-central"
 }