If you are familiar with making child themes, then see single.php file of the clean retina theme. There are many custom hooks. You can add your function to any of the hook to modify it. You could also remove the previous functions hooked to different hooks and add your custom functions.
I confess that I am accustomed to conventional coded WordPress themes without hook, then I’m stuck, I do not see how.
just add the code of the plugin wp-postviews, except in the parent theme, I do not see how this modfication for the child theme.
A beautiful theme but for coders.