fix clipboard handling on osx

tmux.conf

@@ -22,3 +22,4 @@ set -g status-bg green
 if "test `hostname` = newkiwi" "set -g status-bg blue"
 set -g status-fg white
 
+if "test -f /opt/local/bin/reattach-to-user-namespace" "set-option -g default-command '/opt/local/bin/reattach-to-user-namespace bash'"