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

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https://hg.mozilla.org/integration/gaia-central/rev/0687fc8babad
Author: Fabrice Desré <fabrice@desre.org>
Desc: Merge pull request #12799 from cvan/updated-mkt

Bug 925804 - Update Marketplace for webactivities+e.me

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https://hg.mozilla.org/integration/gaia-central/rev/14e54ebb6660
Author: Chris Van <cvan@mozilla.com>
Desc: Bug 925804 - Update Marketplace for webactivities+e.me. r=fabrice

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "fc96abf1e7a5cf056d6c2f987418a1f7d4f5b575", 
+    "revision": "0687fc8babad8b565c276ab2fd9e1ca7a36e9d78", 
     "repo_path": "/integration/gaia-central"
 }