Update to latest uglify lib

bin/handlebars

@@ -203,10 +203,7 @@ if (!argv.simple) {
 output = output.join('');
 
 if (argv.min) {
-  var ast = uglify.parser.parse(output);
-  ast = uglify.uglify.ast_mangle(ast);
-  ast = uglify.uglify.ast_squeeze(ast);
-  output = uglify.uglify.gen_code(ast);
+  output = uglify.minify(output, {fromString: true}).code;
 }
 
 if (argv.output) {

package.json

@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "optimist": "~0.3",
-    "uglify-js": "~1.2"
+    "uglify-js": "~2.3"
   },
   "devDependencies": {
     "benchmark": "~1.0",