moving print_tokens into the actual coffee-script module, so we can use it separately from the command-line

lib/coffee_script/coffee-script.js

@@ -48,6 +48,19 @@
   exports.tree = function tree(code) {
     return parser.parse(lexer.tokenize(code));
   };
+  // Pretty-print a token stream.
+  exports.print_tokens = function print_tokens(tokens) {
+    var __a, __b, __c, strings, token;
+    strings = (function() {
+      __a = []; __b = tokens;
+      for (__c = 0; __c < __b.length; __c++) {
+        token = __b[__c];
+        __a.push('[' + token[0] + ' ' + token[1].toString().replace(/\n/, '\\n') + ']');
+      }
+      return __a;
+    }).call(this);
+    return strings.join(' ');
+  };
   //---------- Below this line is obsolete, for the Ruby compiler. ----------------
   // The path to the CoffeeScript executable.
   compiler = function compiler() {