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

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https://hg.mozilla.org/integration/gaia-central/rev/b77f098a5e95
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #14297 from asutherland/email-msg-list-regression

Bug 943103 - [B2G][Email] Subject and snippet overlap attachment and flagged icons, may cause snippet to wrap so as to not be visible. Regression from bug 917895. r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/bd1e44b33644
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Bug 943103 - [B2G][Email] Subject and snippet overlap attachment and flagged icons, may cause snippet to wrap so as to not be visible. Regression from bug 917895. r=jrburke

Note that r=jrburke is coming from bug 917895 where James's review request
intent was for this but a misunderstanding resulted in the opposite of the
request happening.

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https://hg.mozilla.org/integration/gaia-central/rev/d6feba06f6f5
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #14260 from bobsilverberg/bug945011

Bug 945011 - Update Music app object to use Marionette Actions for tapping

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https://hg.mozilla.org/integration/gaia-central/rev/a51afb7c6297
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 945011 - Update Music app object to use Marionette Actions for tapping