Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/15fcc653301f
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 1072500 - Do not launch FindMyDevice when user triggers Camera from LockScreen

When the user triggers Camera from the LockScreen, FMD will catch the
event and wake up. This consumes a preallocated process at least.
Figures shows that we double the launch time from the Camera app point
of view.

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https://hg.mozilla.org/integration/gaia-2_1/rev/98a88a5cf039
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1078727 - GPS icon in status bar can sometimes take 30–60 seconds to update in B2G 2.1

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https://hg.mozilla.org/integration/gaia-2_1/rev/3fe506359471
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1068470 - [soft-home-button] SHB missing when lockscreen is on, and there is an incoming call

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https://hg.mozilla.org/integration/gaia-2_1/rev/ff7acd120dad
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 1077637 - Actually set the visited history correctly. r=kgrandon

Conflicts:
	apps/system/js/places.js
	apps/system/test/unit/places_test.js

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https://hg.mozilla.org/integration/gaia-2_1/rev/e38fe08477b5
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1073484 - [GAIA][Contacts]Edit two times in contact search result in improper contact data

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https://hg.mozilla.org/integration/gaia-2_1/rev/40341dd72c90
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1078654 - [Usage][Cost Control] In Usage app - Hide Apps from Mobile Data Usage list if they use 0 data
Bumping manifests a=b2g-bump