cairomm maintenance

The ever helpful Jonathan Jongsma is now officialy co-maintainer of cairomm, on which gtkmm 2.10 will depend. I wanted him to take over completely, but he’d like to keep it co- for now. I don’t expect any major changes, but we should expect that high Jongsma quality. I don’t think he has a blog yet, but the does have this nifty little Colorscheme application.