Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/487c820036eb
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 1021285 - Wallpaper Picker Screen needs a few updates r=kgrandon

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https://hg.mozilla.org/integration/gaia-2_0/rev/382c892b259a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20159 from eeejay/bug-1020605

Bug 1020605 - (gaia-grid) Append all children to shadow root by removing selector tag.

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https://hg.mozilla.org/integration/gaia-2_0/rev/ff5889e60f98
Author: Fernando Campo <fernando.campo@telefonica.com>
Desc: Merge pull request #20238 from fcampo/import-merged-981674

Bug 981674 - [Contacts] Merged-name-contact imported is not is not shown fine (r=jmcf)
Bumping manifests a=b2g-bump