Include dotfiles for Mac

Excluded some Ubuntu specific configs. I'm still in two minds whether it
would be better to iterate over all available files instead of specifying
them like this.
Drop subversion

Hopefully I won't have to touch it again for a long time.
Merge branch 'master' into mac_homebrew
gitg doesn't exist for Mac

I haven't found a good alternative to browse branch trees yet.
Add shell and vcs utils to Mac.
Break virt and web onto a separate line

Diff will read nicer. That is all.
Update README with new commands.