Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/5e8d0c03caa2
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #20150 from eliperelman/bug-837668-implement-loading-events-dialer

Bug 837668 - Implementing new startup loading events in Dialer app

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https://hg.mozilla.org/integration/gaia-central/rev/86b467c1625a
Author: Eli Perelman <eli@eliperelman.com>
Desc: Bug 837668 - Implementing new startup loading events in Dialer app

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https://hg.mozilla.org/integration/gaia-central/rev/a3a37652f10a
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #20252 from hfiguiere/bug1019037

Bug 1019037 - Set a starting event for the call log test. r=etienne,eli

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https://hg.mozilla.org/integration/gaia-central/rev/d81f0e516bfd
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 1019037 - Set a starting event for the call log test. r=etienne,eli
Bumping manifests a=b2g-bump