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

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https://hg.mozilla.org/integration/gaia-central/rev/0afebbe4f7fe
Author: KWierso <kwierso@gmail.com>
Desc: Empty commit to hopefully get the bumper bot working again

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https://hg.mozilla.org/integration/gaia-central/rev/106d07c44cac
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #21131 from nullaus/bug1029609

bug 1029609 - Show spinner when loading new collections. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/74c09071bea3
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 1029609 - Show spinner when loading new collections. r=kgrandon
Bumping manifests a=b2g-bump