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

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https://hg.mozilla.org/integration/gaia-central/rev/72d70c2b376f
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #12517 from asutherland/autoconfig-t-online

Bug 914520 - Skip t-online.de ActiveSync autodiscover by adding local autoconfig entry. rs=squb, a=blocking-b2g=leo+

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https://hg.mozilla.org/integration/gaia-central/rev/03c9f02ce19e
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Bug 914520 - Skip t-online.de ActiveSync autodiscover by adding local autoconfig entry

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "81b9711ad71e80b379dab8b2e78c5c02547fa423", 
+    "revision": "72d70c2b376f5cd60ebfd7e0b108af3a2d404e38", 
     "repo_path": "/integration/gaia-central"
 }