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

========

https://hg.mozilla.org/integration/gaia-central/rev/ee57ea11db8c
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #17693 from yurenju/stage-windows-squash-3

Bug 897352 - [gaia build system] Transition to a build_stage for assembl... r=@ochameau

========

https://hg.mozilla.org/integration/gaia-central/rev/b5bd3bbd054b
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 897352 - [gaia build system] Transition to a build_stage for assembling apps

Conflicts:
	Makefile
	apps/communications/build/build.js
	build/copy-build-stage-manifest.js
	build/test/integration/distribution.test.js
	build/utils-xpc.js
	build/utils.js
	build/webapp-manifests.js

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "7404866e6b75d662907914cb763982d9a0979eb8", 
+    "revision": "ee57ea11db8c21476ec6e742b22b12d9bb6016aa", 
     "repo_path": "/integration/gaia-central"
 }