Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/5686a4726b2c
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 1108008 - Fix the destination path for the dialer and calendar reference workloads' databases r=jhylands

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https://hg.mozilla.org/integration/gaia-central/rev/b2ee7022edab
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1095120 - merge pull request #26209 from stasm:1095120-async-format to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/b58c524523c0
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 1095120 - Add async mozL10n.format{Value,Entity} methods. r=gandalf

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "49143a92bd204c4d2af2fc2e273628e2eec03a0c", 
+    "revision": "5686a4726b2c90d5bd20cf96f8e97038cbe3f083", 
     "repo_path": "integration/gaia-central"
 }