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

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https://hg.mozilla.org/integration/gaia-central/rev/7d606b46ba63
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #17287 from DouglasSherk/983054-dsds-suggestions

Bug 983054 - [DSDS][Dialer] Only fill active number instead of calling from suggestions bar on dual SIM devices. r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/42a0fd576e41
Author: DouglasSherk <github@sherk.me>
Desc: Bug 983054 - [DSDS][Dialer] Only fill active number instead of calling from suggestions bar on dual SIM devices. r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/5dadca23b7b3
Author: RickyChien <ricky060709@gmail.com>
Desc: Merge pull request #17361 from RickyChien/bug-984251

Bug 984251 - ./bin/gaia-test and Travis-CI unit tests should be working with test_apps r=@yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/e3a1c9660ec0
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Bug 984251 - ./bin/gaia-test and Travis-CI unit tests should be working with test_apps
Bumping manifests a=b2g-bump