Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/8dc91d6255c2
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1125684 - merge pull request #27858 from KevinGrandon:bug_1125684_update_autolander_readme to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/5ba102787602
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1125684 - Update README.md for autolander launch r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/cc4587610fc0
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 886534 - merge pull request #27856 from mcav:land-internaldate to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/e055dce034f3
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 886534 - Contend with INTERNALDATE timezones for date-range resyncing. r=asuth r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/8d3ee9c214b2
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1118025 - merge pull request #27712 from albertopq:1118025-rocketbar-icons-transition to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/66c74b16aea6
Author: albertopq <albert.pastor@gmail.com>
Desc: Bug 1118025 - Only recalculating statusbar width when collapsed

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "edeb624cd5b5829d14a52a0dbc8bd3b7203b8331", 
+        "git_revision": "c509f0492a365585558bdbff1ad5f79e18e6c6d0", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "16b58c1225ad8c0061dd01e224c5b4fd3e9ef12f", 
+    "revision": "8dc91d6255c24fb9ee29b3985dd83ca60d3e09ae", 
     "repo_path": "integration/gaia-central"
 }