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The 7.x-2.x version of Sky is a now a sub-theme of Adaptivetheme 7.x-2.x and thus inherits all its theme settings including responsive layouts. Additionally I have added Font settings (with Google fonts), and many other settings to allow users to configure and customize the theme from within the theme configuration.
In this development version the very cool color preview system is deprecated - I need to consider whether to support the Color Theme module, because I will probably need to maintain that module and maintain this themes support for it long term - I'm not sure I can commit to that at this stage. In this version there is no preview at all, its been removed because its difficult to support (time consuming to build with little actual benefit to the user).