Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/6e0504e89f4a
Author: Doug Sherk <github@sherk.me>
Desc: Bug 1092389 - Add 'ehrpd' to list of CDMA network modes. r=gsvelto

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https://hg.mozilla.org/integration/gaia-2_1/rev/e3b472a73892
Author: Punam Dahiya <punamdahiya@yahoo.com>
Desc: Bug1088051 - Fix of stuck in image edit window on clicking edit icon immediately after image delete r=djf

Conflicts:
	apps/gallery/js/ImageEditor.js

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https://hg.mozilla.org/integration/gaia-2_1/rev/9df5ce46f0fe
Author: Ted Clancy <tclancy@mozilla.com>
Desc: Bug 1078901 - Confirmation dialog when deleting apps blocks notfications and software home button. r=kgrandon

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https://hg.mozilla.org/integration/gaia-2_1/rev/9bc3be773911
Author: ranjith.gutha <ranjith.gutha@lge.com>
Desc: Bug-1050129 [Gallery] Single file delete delay fix
Bumping manifests a=b2g-bump