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

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https://hg.mozilla.org/integration/gaia-2_1/rev/f25c1dd3a4c0
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1074432 - [email] display of unsynced folder has overlapping messages

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https://hg.mozilla.org/integration/gaia-2_1/rev/0ddee49a62be
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1064463 - Do not set caller id explicitly when users preference is not available

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https://hg.mozilla.org/integration/gaia-2_1/rev/30db3e098a4d
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1069992 - [E-Mail] Wobbly Refresh Icon Animation

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https://hg.mozilla.org/integration/gaia-2_1/rev/15af3e1d5be0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1073728 - Reset favicons object after location change r=alive r=daleharvey
Bumping manifests a=b2g-bump