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

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https://hg.mozilla.org/integration/gaia-central/rev/5c259bd22f64
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #21169 from vingtetun/bug1021857

Bug 1021857 - [B2G][2.0][Everything.me ] User can get e.me to appear ove...

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https://hg.mozilla.org/integration/gaia-central/rev/97e5906d1b5e
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1021857 - [B2G][2.0][Everything.me ] User can get e.me to appear over the dialer when on a call. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/a125157fc7ef
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #21187 from vingtetun/bug1032131

Bug 1032131 - [Homescreen] Statusbar is not opaque anymore when entering...

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https://hg.mozilla.org/integration/gaia-central/rev/bf80ac3cec17
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1032131 - [Homescreen] Statusbar is not opaque anymore when entering edit mode. r=kgrandon
Bumping manifests a=b2g-bump