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

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https://hg.mozilla.org/integration/gaia-central/rev/863b056250f6
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1149234 - merge pull request #29269 from punamdahiya:Bug1149234 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/0cb02b250484
Author: Punam Dahiya <punamdahiya@yahoo.com>
Desc: Bug 1149234 - [Gallery] Enable Apply button on selecting more aspect ratio in crop edit tool r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/156ee3ca398a
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1140220 - merge pull request #29267 from punamdahiya:Bug1140220 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/0ef2465416c9
Author: Punam Dahiya <punamdahiya@yahoo.com>
Desc: Bug 1140220 - [Camera][RTL] Mirror confirmation buttons in RTL mode r=wilsonpage

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "960d35c018c8917ccd3212039e16a8b14c112612", 
+        "git_revision": "4386d6f1ec402df08288470036b0eadbb8eae6c8", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "0ff29af23a0160a7b0d72e1c20aff251e7da99e7", 
+    "revision": "863b056250f60dda83973a296afdf91d91a887be", 
     "repo_path": "integration/gaia-central"
 }