Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/e0cc4a34ba83
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #10459 from gasolin/issue-877675-2

fix regression of Bug 877675, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/a29e920f44eb
Author: gasolin <gasolin@gmail.com>
Desc: fix regression of Bug 877675
Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/de03a5f157a7
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #10372 from Rik/pre-commit-882116

Bug 882116 - Install a pre-commit hook to run the linter tests r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/480400239f31
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 882116 - Install a pre-commit hook to run the linter tests

Also enables --multiprocess for make lint