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

========

https://hg.mozilla.org/integration/gaia-central/rev/18800bea8388
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20558 from crdlc/bug-1025848

Bug 1025848 - [Vertical Homescreen] Gesture with two or more fingers ends in edit mode or showing the context menu

========

https://hg.mozilla.org/integration/gaia-central/rev/f5e043d46433
Author: crdlc <crdlc@tid.es>
Desc: Bug 1025848 - [Vertical Homescreen] Gesture with two or more fingers ends in edit mode or showing the context menu

========

https://hg.mozilla.org/integration/gaia-central/rev/16989ec84a14
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 987063 - Split the Gaia UI tests in Travis into smaller chunks. r=zcampbell

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "c44565ed6a5eacdb9fa30eb973d5413f9f44e985", 
+    "revision": "18800bea838856f785f2824d4d6753f10f740bdd", 
     "repo_path": "/integration/gaia-central"
 }