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

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https://hg.mozilla.org/integration/gaia-central/rev/e20fe860d63f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1029766 - Intermittent TEST-UNEXPECTED-FAIL | collection_test.js | Vertical - Collection drag icon (/w entry point) into collection r=crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/49d733f3a96c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1029766 - Intermittent TEST-UNEXPECTED-FAIL | collection_test.js | Vertical - Collection drag icon (/w entry point) into collection r=crdlc"

This reverts commit 6cb2e93790340d18d771a4c532ecfb968fa38c51.
Bumping manifests a=b2g-bump