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

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https://hg.mozilla.org/integration/gaia-central/rev/e158e50fd7ab
Author: evelynhung <jj.evelyn@gmail.com>
Desc: Merge pull request #12417 from evelynhung/issue-900399

Issue 900399 v1 train (cherry picked from commit 2cae0622ee942906daaca90293441afdbd2cb7de)

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https://hg.mozilla.org/integration/gaia-central/rev/cdb4a6c35d9f
Author: evelynhung <jj.evelyn@gmail.com>
Desc: Issue 900399 v1 train (cherry picked from commit 2cae0622ee942906daaca90293441afdbd2cb7de)

Bug 900399 - let maximum image pixel resolution customizable, r=djf

Conflicts:

	build/applications-data.js

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "7a3d5b91ffa1f443084b8a05582030dc13877e17", 
+    "revision": "e158e50fd7abdbd4af987a6e42dd5d3a5f5a707d", 
     "repo_path": "/integration/gaia-central"
 }