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

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https://hg.mozilla.org/integration/gaia-central/rev/326d3bcf1868
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #16166 from yurenju/comm-makefile

Bug 968675 - Add Makefile for communications r=@timdream

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https://hg.mozilla.org/integration/gaia-central/rev/d90552ecba05
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 968675 - Add Makefile for communications

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "7f2c724873fa225f65b5c553bc882b32c1d24d11", 
+    "revision": "326d3bcf186810a25678dffc0bf11af7d9f300a1", 
     "repo_path": "/integration/gaia-central"
 }