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

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https://hg.mozilla.org/integration/gaia-central/rev/f145a5a22194
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 982260 - [Contacts] Disable intermittent test

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https://hg.mozilla.org/integration/gaia-central/rev/954b7021f773
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #17183 from cctuan/983564

Bug 983564 - [Gaia] [Build] reduce |make| time

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https://hg.mozilla.org/integration/gaia-central/rev/ea9088ca3ee7
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 983564 - [Gaia] [Build] reduce |make| time
Bumping manifests a=b2g-bump