Bug 1106585 - Port 'Bug 1094565 - Update sccache to e68dfc2' to comm-central and comm-aurora r=standard8

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extra : amend_source : 682ea5a4487e677e01955e9fa91bbbcd0519c6cf
Bug 910293 - Part 1: Remove jquery methods in test-newmailaccount-helpers.js. r=mkmelin

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extra : amend_source : 57039c8d9abbc921817d050a609e38f782089cfb
Bug 910293 - Part 2: Do not use jquery's fadeIn/fadeOut which is the cause of intermittent failures. r=mkmelin

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extra : amend_source : 680b732b48899614ac82b51de33f01905abdc225
Bug 1106349 - Port Bug 1102416 - Add preferences for searchplugins in US region. r=mkmelin a=clokep on a CLOSED TREE

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extra : amend_source : eb220601045af7f571af1ba8995fdf54c15cb873