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