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

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https://hg.mozilla.org/integration/gaia-central/rev/b8a384c2d6c1
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #18255 from evanxd/bug-988516

Bug 988516 - [Calendar] Intermittent failing test, day view events longer than 2h click after first hour

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https://hg.mozilla.org/integration/gaia-central/rev/103637f13c01
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 988516 - Enable the "click after first hour" test.

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https://hg.mozilla.org/integration/gaia-central/rev/43dc17161dd2
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 988516 - Add waitForTextNotEmpty function in view.js.
Bumping manifests a=b2g-bump