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

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https://hg.mozilla.org/integration/gaia-central/rev/b172cd6c43e0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #29397 from KevinGrandon/bug_1152403_update_jshint_263

Bug 1152403 - Bump jshint to 2.6.3 for template literal fixes

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https://hg.mozilla.org/integration/gaia-central/rev/b4a285788004
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1152403 - Bump jshint to 2.6.3 for template literal fixes r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/b4b31ff30199
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #29395 from KevinGrandon/bug_1151177_gaia_select_rtl_arrow

Bug 1151177 - [Components] Update gaia_select arrow style for RTL

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https://hg.mozilla.org/integration/gaia-central/rev/4536afe914f0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1151177 - [Components] Update gaia_select arrow style for RTL

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https://hg.mozilla.org/integration/gaia-central/rev/d840b1b27202
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1152181 - merge pull request #29393 from daleharvey:1152181 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/6c543dd6d170
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 1152181 - Update the strings used during log capture. r=gerard-majax

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "731413db16111a0016442dfb377355522c3b5dd2", 
+        "git_revision": "2a782fffe23bea0b6ed37ed0cf45de755ace2ec3", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "37322668e6bc574322baa82e57529ab3e0df3af4", 
+    "revision": "b172cd6c43e0070be320a26d63cd0c1d9cfae1b5", 
     "repo_path": "integration/gaia-central"
 }