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The preview-image does not load, because of
Refused to load the image 'http://github.com/jeremyFreeAgent/oh-my-zsh-powerline-theme/raw/master/preview.png' because it violates the following Content Security Policy directive: "img-src 'self' data: assets-cdn.github.com identicons.github.com www.google-analytics.com collector.githubapp.com *.githubusercontent.com *.gravatar.com *.wp.com".