Add tmux \^a bindings and pane swapping

.tmux.conf

@@ -1,9 +1,9 @@
 
 ### screen-like keybindings
-#unbind C-b
-#set -g prefix C-a
-#bind C-a last-window
-#bind a send-prefix
+unbind C-b
+set -g prefix C-a
+bind C-a last-window
+bind a send-prefix
 #bind A command-prompt "rename-window %%"
 #bind Escape copy-mode
 
@@ -25,6 +25,12 @@ bind l select-pane -R
 #bind Tab down-pane
 #bind BTab up-pane
 
+# swapping
+#bind Left  swap-pane -L
+bind Up    swap-pane -U
+bind Down  swap-pane -D
+#bind Right swap-pane -R
+
 # Reload key
 bind r source-file ~/.tmux.conf