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

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https://hg.mozilla.org/integration/gaia-central/rev/7319f9447565
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #17007 from vingtetun/bug981440

Bug 981440 - Add a CSS linter to the build system. r=ochameau

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https://hg.mozilla.org/integration/gaia-central/rev/0d2cd9e2d98c
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 981440 - Add a CSS linter to the build system. r=ochameau

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "branch": "", 
         "revision": ""
     }, 
-    "revision": "ce29ee9e45ba88a7963d003d382a931324e7da96", 
+    "revision": "7319f9447565e768790bd77b313327b982717da2", 
     "repo_path": "/integration/gaia-central"
 }