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

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https://hg.mozilla.org/integration/gaia-2_1/rev/8ae4ae81a686
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1074033 - Absolute positioning dialogs when hidden

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https://hg.mozilla.org/integration/gaia-2_1/rev/71e7b43b0a3e
Author: Tamara Hills <thills@mozilla.com>
Desc: Bug 1068109 - Restore 2s delay before callscreen is closed.

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https://hg.mozilla.org/integration/gaia-2_1/rev/06dd915e3145
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1071512 - Overlapping status bar icons

Conflicts:
	apps/system/style/statusbar/statusbar.css

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https://hg.mozilla.org/integration/gaia-2_1/rev/d77344100f3b
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 1043712 - [Music] listen to touchend instead of click events

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https://hg.mozilla.org/integration/gaia-2_1/rev/6dd0f90f25c2
Author: vincentliu <vliu@mozilla.com>
Desc: Bug 1070791 - [camera] Face Detection box is not disappear without face after taking a picture. r=justindarc
Bumping manifests a=b2g-bump