Add support for iTerm2's Tmux integration

This should resolve #52.

libexec/tmuxifier-load-session

@@ -7,7 +7,7 @@ source "$TMUXIFIER/lib/util.sh"
 
 # Provide tmuxifier help
 if calling-help "$@"; then
-  echo "usage: tmuxifier load-session <layout_name | file_path>
+  echo "usage: tmuxifier load-session <layout_name | file_path> [<iterm mode>]
 
 Aliases: session, ses, s
 
@@ -30,5 +30,9 @@ fi
 # Load runtime functions.
 source "$TMUXIFIER/lib/runtime.sh"
 
+if [ "$2" == "-CC" ]; then
+  export TMUXIFIER_TMUX_ITERM_ATTACH="-CC"
+fi
+
 # Load session file.
 load_session "$1"