Add save buffer feature to tmux config (#27)

Author: kjaroma

.tmux.conf

@@ -1,6 +1,7 @@
 set exit-unattached off
 set exit-empty off
 set -g status-position top
+set-option -g history-limit 10000
 
 set -g default-terminal "screen-256color"
 set -g mouse on
@@ -10,3 +11,5 @@ bind-key -n F1 select-window -t 1
 bind-key -n F2 select-window -t 2
 bind-key -n F3 select-window -t 3
 bind-key -n F4 select-window -t 4
+
+bind-key P command-prompt -p 'save history to filename:' -I '~/tmux.history' 'capture-pane -S -32768 ; save-buffer %1 ; delete-buffer'