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

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https://hg.mozilla.org/integration/gaia-central/rev/73442e5ccb1e
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 1049723 - Post logs to Treeherder report. r=rwood r=jlal

========

https://hg.mozilla.org/integration/gaia-central/rev/9caeaa8e5443
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 1049723 - Exclude the artifact path from the link in Treeherder. r=rwood

========

https://hg.mozilla.org/integration/gaia-central/rev/1b52998366d8
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 1049723 - Replaced Treeherder command line options with environment variables. r=rwood

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "e7a7c126f48f4ea3bded1f2e9ee5e4f79ae1be9e", 
+    "revision": "73442e5ccb1efa7a1b62200c8d3e5ac13c02c6ef", 
     "repo_path": "/integration/gaia-central"
 }