Update 'tm' function to take multiple files on the command-line

plugins/textmate/textmate.plugin.zsh

 # If the tm command is called without an argument, open TextMate in the current directory
 # If tm is passed a directory, cd to it and open it in TextMate
-# If tm is passed a file, open it in TextMate
+# If tm is passed anything else (i.e., a list of files and/or options), pass them all along
+#    This allows easy opening of multiple files.
 function tm() {
 	if [[ -z $1 ]]; then
 		mate .
-	else
+	elif [[ -d $1 ]]; then
 		mate $1
-		if [[ -d $1 ]]; then
 		cd $1
-		fi
+	else
+		mate "$@"
 	fi
 }