tmux: Remove reattach-to-user-namespace

This works now out of the box! Thanks to @gabebw for the tip.

Fixes #28

Brewfile

@@ -28,7 +28,6 @@ brew 'mplayer'
 brew 'neovim'
 brew 'pinentry-mac'
 brew 'procmail'
-brew 'reattach-to-user-namespace'
 brew 'recode'
 brew 'the_silver_searcher'
 brew 'thoughtbot/formulae/gitsh'

tmux.conf

@@ -2,7 +2,7 @@
 # General {{{
 # ============================================================================
 
-set-option -g default-command "reattach-to-user-namespace -l zsh"
+set-option -g default-command "zsh"
 set -g default-terminal "screen-256color"
 set -g history-limit 20000
 set-option -sg escape-time 10
@@ -26,7 +26,7 @@ unbind r
 bind-key r source-file ~/.tmux.conf \; display-message "~/.tmux.conf reloaded"
 
 # Open a temporary split with gitsh
-bind g split-window -h -c '#{pane_current_path}' -l 83 'reattach-to-user-namespace gitsh'
+bind g split-window -h -c '#{pane_current_path}' -l 83 'gitsh'
 
 # jump between sessions
 unbind p
@@ -40,7 +40,7 @@ bind-key u capture-pane -J \; \
 
 # copy/paste
 bind-key -T copy-mode-vi v send -X begin-selection
-bind-key -T copy-mode-vi y send -X copy-pipe-and-cancel 'reattach-to-user-namespace pbcopy'
+bind-key -T copy-mode-vi y send -X copy-pipe-and-cancel 'pbcopy'
 
 # Open new windows in the same directory as the parent
 bind c new-window -c "#{pane_current_path}"