Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/7d86aed57eca
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1002417 - [Web Components] Add simple readme for web component usage in gaia. r=drs (over irc)

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "c7851acf91df9e32ea4cbfe322b8dcdaa6a8fc5f", 
+    "revision": "7d86aed57eca90f7c5b776a6da8dabfa073b5939", 
     "repo_path": "/integration/gaia-central"
 }