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

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https://hg.mozilla.org/integration/gaia-central/rev/ef0235b883e6
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13227 from bebef1987/ev.me

Bug 932339 - Fix failing test_everythingme_app_install.py

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https://hg.mozilla.org/integration/gaia-central/rev/e600c68fbf46
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 932339 - Fix failing test_everythingme_app_install.py

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https://hg.mozilla.org/integration/gaia-central/rev/b93db0b790c9
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Merge pull request #13226 from fcampo/lazyloader-dup-932794

Bug 932794 - Duplicate load of LazyLoader (r=jmcf)

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https://hg.mozilla.org/integration/gaia-central/rev/e2a2fd1ba288
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Bug 932794 - Duplicate load of LazyLoader