Add tmux-yank binding for Linux

tmux.conf

@@ -65,6 +65,11 @@ bind-key u capture-pane \; split-window "tmux show-buffer | urlview -"
 
 # Enter copy mode with C-U
 bind-key C-u copy-mode -u
+# Begin selection in copy mode with v not Space
+bind-key -T copy-mode-vi v send-keys -X begin-selection
+# Yank to the system clipboard in copy mode
+if -b '[ "`uname`" = "Linux" ]' \
+  "bind-key -T copy-mode-vi y send-keys -X copy-pipe-and-cancel 'xsel -i -p && xsel -o -p | xsel -i -b'"
 
 # Left status style
 set-window-option -g status-left " #S"