Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/51a3d7755ad0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20883 from crdlc/bug-1025519

Bug 1025519 - (vertical-homescreen) App icons are smaller than spec'd

========

https://hg.mozilla.org/integration/gaia-central/rev/f15eb143ab1d
Author: crdlc <crdlc@tid.es>
Desc: Bug 1025519 - (vertical-homescreen) App icons are smaller than spec

========

https://hg.mozilla.org/integration/gaia-central/rev/f5bedefc3b17
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #20814 from etiennesegonzac/bug-1028270

Bug 1028270 - Edge swipes should dismiss the activity picker r=alive

========

https://hg.mozilla.org/integration/gaia-central/rev/5a9a6806363b
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1028270 - Edge swipes should dismiss the activity picker

========

https://hg.mozilla.org/integration/gaia-central/rev/b964865a9259
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #20803 from etiennesegonzac/bug-1028154

Bug 1028154 - Dismiss value selectors when an edge gesture starts transition. r=alive

========

https://hg.mozilla.org/integration/gaia-central/rev/bfa940655824
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1028154 - Dismiss value selectors when an edge gesture starts transitioning.
Bumping manifests a=b2g-bump