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

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https://hg.mozilla.org/integration/gaia-central/rev/b8a031b1d0d2
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1156138 - merge pull request #29586 from KevinGrandon:bug_1156138_jshint_sharedtest to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/b1296dd944a8
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1156138 - Fix remaining sharedtest jshint issues

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "6edbddca827ac892831e241c250a0a2d0d171dbe", 
+        "git_revision": "0645bbed4d6cbd8064652eebafe011edc3e417fd", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "4f9a0f287ac6196275c53fce16115daf68f89bad", 
+    "revision": "b8a031b1d0d2dfe6dc33194ec18b25c6f0cd625a", 
     "repo_path": "integration/gaia-central"
 }