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

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https://hg.mozilla.org/integration/gaia-central/rev/1572d6b1bc57
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1152727 - merge pull request #29426 from shamenchens:Bug1152727-JshintMarionette to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/b3be660feb94
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 1152727 - Fix jshint error in system app marionette test

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https://hg.mozilla.org/integration/gaia-central/rev/5d1f14d34949
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1153069 - merge pull request #29448 from julienw:1153069-fix-multilocale-debug-mode to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/4cb2f1b9e2b0
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1153069 - Multilocale env vars break ./bin/gaia-test r=ricky

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "a5054332926691f429706b90e84826d5a37766b2", 
+        "git_revision": "1a92368407df6f3bab5de4e86e2a0d2358a1447b", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "9d67507c3b8210d36bc9653cc546489e02aa953c", 
+    "revision": "1572d6b1bc57b0466a9a626b9a549464aa06172a", 
     "repo_path": "integration/gaia-central"
 }