[Merge] lp:~phablet-team/ubuntu-system-settings/main_list_view into lp:ubuntu-system-settings

[Ken VanDine]

I think this looks good now, but the update available icon probably shouldn't be color.
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https://code.launchpad.net/~phablet-team/ubuntu-system-settings/main_list_view/+merge/308521
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