Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/dd2c2de99ae3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1081764 - [Collection] Save collection on enter press r=crdlc

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https://hg.mozilla.org/integration/gaia-2_1/rev/f1724407e26d
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1081764 - [Bookmark] Save bookmark on enter press r=crdlc

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https://hg.mozilla.org/integration/gaia-2_1/rev/15a650e435d5
Author: mai <mri@tid.es>
Desc: Bug 1080479 - [Usage] By application totals are not reset

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https://hg.mozilla.org/integration/gaia-2_1/rev/2154cb456164
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 1081346 - Update status appearance on activity termination. r=alive

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https://hg.mozilla.org/integration/gaia-2_1/rev/e4178fb7475f
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1069500 - Promote permission dialog to on top of attention window
Bumping manifests a=b2g-bump