remove yankring submodule

Signed-off-by: Jeremy C. Andrus <jeremya@cs.columbia.edu>
fixup pbcopy/pbpaste on OSX through tmux

This is slow-ish and awkward, but it actually works...

Signed-off-by: Jeremy C. Andrus <jeremya@cs.columbia.edu>
don't auto update so often

Signed-off-by: Jeremy C. Andrus <jeremya@cs.columbia.edu>
Merge branch 'master' of github.com:afrojer/vim-config