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

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https://hg.mozilla.org/integration/gaia-central/rev/be75b3aaf010
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1027090 - [Travis] Use fewer jobs when splitting r=me

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https://hg.mozilla.org/integration/gaia-central/rev/e3f4b50c1645
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #20634 from DouglasSherk/1026081-missed-api

Bug 1026081 - [Dialer] Fix missed telephony API upgrade to TelephonyCallId. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/0bd27113d71d
Author: DouglasSherk <github@sherk.me>
Desc: Bug 1026081 - [Dialer] Fix missed telephony API upgrade to TelephonyCallId. r=etienne
Bumping manifests a=b2g-bump