Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/ff1381c0a693
Author: Ran Ben Aharon <ran@ranbena.com>
Desc: Bug 1028691 - [Collection app] Background images sometimes in poor quality

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https://hg.mozilla.org/integration/gaia-2_0/rev/fd2a267ff0bf
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #20976 from etiennesegonzac/bug-1029789

Bug 1029789 - Fade the homescreen's inline activities when we fade the homescreen r=21

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https://hg.mozilla.org/integration/gaia-2_0/rev/a8d899fc3332
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #21040 from vingtetun/opaque.statusbar

Bug 1028708 - Statusbar not opaque when opening the contextMenu in verti...

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https://hg.mozilla.org/integration/gaia-2_0/rev/f4e844f25abd
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #21039 from vingtetun/contextmenu.img

Bug 1028470 - Long press on images opened from search app displays empty...

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https://hg.mozilla.org/integration/gaia-2_0/rev/9ac88751734f
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #20889 from gtorodelvalle/dialer-callscreen-bug-1007709-fluid-font-size

Bug 1007709 - [Dialer][Call Screen] Create fluid size for contact name in the upper information panel
Bumping manifests a=b2g-bump