[Design-team] F21 anaconda artwork

Hi folks, Just a heads up - David Shea pointed me to this bug and Elad made a good comment here: https://bugzilla.redhat.com/show_bug.cgi?id=1131254 The buttons in Anaconda are going to be the bright GTK blue so we should probably use the darker Fedora blue (or something darker maybe) so that the blue buttons pop against the background and don't melt away into it. I'm up for taking care of the anaconda artwork (I've already done it for RHEL.) If anybody wants to help lemme know! I'll post anything I do here for critique. ~m