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

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https://hg.mozilla.org/integration/gaia-central/rev/bed3f5f3a2b7
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #25246 from snowmantw/bug1081132

Bug 1081132 - Possible to get lock screen into landscape mode

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https://hg.mozilla.org/integration/gaia-central/rev/6b3a45263f95
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1081132 - Possible to get lock screen into landscape mode

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https://hg.mozilla.org/integration/gaia-central/rev/7825d4d32245
Author: Tzu-Lin Huang <dwi019@gmail.com>
Desc: Merge pull request #25477 from dwi2/bug1076706

Bug 1076706 - [Smart Screen][Home] Implement card listing and launching function r=rexboy, evelynhung

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https://hg.mozilla.org/integration/gaia-central/rev/27b6fe280d3b
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Bug 1076706 - [Smart screen][Home] Implement card listing and launching function
Bumping manifests a=b2g-bump