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

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https://hg.mozilla.org/integration/gaia-2_1/rev/0931d0d9f617
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1066869 - Do not wait transition to show contact photo anymore

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https://hg.mozilla.org/integration/gaia-2_1/rev/1809fd63e73b
Author: crdlc <crdlc@tid.es>
Desc: Bug 1067427 - [Contacts] [Regression] Contacts photo / image are lost under certain interactions made by the user

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https://hg.mozilla.org/integration/gaia-2_1/rev/f1b1988887d6
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 1059470 - Fallback to favicon.ico. r=kgrandon

Conflicts:
	apps/system/js/app_chrome.js

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https://hg.mozilla.org/integration/gaia-2_1/rev/be75671d7ab8
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1063311 - [Contacts] Warning page does not work when tap email in user contact
Basically reverts f695792496326679702a0b2f48a9c384fd47473a
Bumping manifests a=b2g-bump