Redmine theme

Dear all, I suggest to change a stock Redmine theme to something more beautiful, for example gitmike: https://github.com/makotokw/redmine-theme-gitmike which used by srlabs.de and looks like pretty. Furthermore, the Osmocom logo will look better on light background. Opinions? С наилучшими пожеланиями, Яницкий Вадим.