Remove custom bindings for pane zooming

tmux 1.8 has native zooming bound to <prefix>z by default.

tmux.conf

@@ -135,18 +135,6 @@ bind-key -r l resize-pane -R
 # Allow the escape key to quit the command mode
 bind-key -ct vi-edit Escape cancel
 
-# Pane zooming
-# Unbind the - key first
-unbind-key -
-bind-key + \
-    new-window -d -n tmux-zoom 'clear && echo TMUX ZOOM && read' \;\
-    swap-pane -s tmux-zoom.1 \;\
-    select-window -t tmux-zoom
-bind-key - \
-    last-window \;\
-    swap-pane -s tmux-zoom.1 \;\
-    kill-window -t tmux-zoom
-
 # Clear history
 # Bash uses C-l to clear the screen, so you can use C-l, M-k to clear the
 # screen and the scrollback buffer too
@@ -237,6 +225,7 @@ bind-key -n M-9 select-window -t :9
 # bind-key          t clock-mode
 # bind-key          w choose-window
 # bind-key          x confirm-before -p "kill-pane #P? (y/n)" kill-pane
+# bind-key          z resize-pane -Z
 # bind-key          { swap-pane -U
 # bind-key          } swap-pane -D
 # bind-key          ~ show-messages