Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/729dca201388
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #13306 from bobsilverberg/v1.2lockscreen

Bug 934132 - [v1.2] Update lockscreen app and tests to be in line with master

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https://hg.mozilla.org/integration/gaia-1_2/rev/4fe130731db5
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 934132 - [v1.2] Update lockscreen app and tests to be in line with master
Incorporate changes from commit 5ff9232461a9d562e0a608c4b17b08efc723145f