title: Uglify throws Parse error
body: <p>When i use gulp-uglify with browserify i get a error</p>
  
  <pre><code>events.js:72
          throw er; // Unhandled 'error' event
                ^
  Error
      at new JS_Parse_Error (/home/rkmax/my-project/node_modules/gulp-uglify/node_modules/uglify-js/lib/parse.js:189:18)
      at js_error (/home/rkmax/my-project/node_modules/gulp-uglify/node_modules/uglify-js/lib/parse.js:197:11)
      at croak (/home/rkmax/my-project/node_modules/gulp-uglify/node_modules/uglify-js/lib/parse.js:656:9)
      at token_error (/home/rkmax/my-project/node_modules/gulp-uglify/node_modules/uglify-js/lib/parse.js:664:9)
      at expect_token (/home/rkmax/my-project/node_modules/gulp-uglify/node_modules/uglify-js/lib/parse.js:677:9)
      at expect (/home/rkmax/my-project/node_modules/gulp-uglify/node_modules/uglify-js/lib/parse.js:680:36)
      at /home/rkmax/my-project/node_modules/gulp-uglify/node_modules/uglify-js/lib/parse.js:1222:13
      at /home/rkmax/my-project/node_modules/gulp-uglify/node_modules/uglify-js/lib/parse.js:703:24
      at expr_atom (/home/rkmax/my-project/node_modules/gulp-uglify/node_modules/uglify-js/lib/parse.js:1152:35)
      at maybe_unary (/home/rkmax/my-project/node_modules/gulp-uglify/node_modules/uglify-js/lib/parse.js:1327:19)
      at expr_ops (/home/rkmax/my-project/node_modules/gulp-uglify/node_modules/uglify-js/lib/parse.js:1362:24)
      at maybe_conditional (/home/rkmax/my-project/node_modules/gulp-uglify/node_modules/uglify-js/lib/parse.js:1367:20)
      at maybe_assign (/home/rkmax/my-project/node_modules/gulp-uglify/node_modules/uglify-js/lib/parse.js:1391:20)
      at expression (/home/rkmax/my-project/node_modules/gulp-uglify/node_modules/uglify-js/lib/parse.js:1410:20)
  </code></pre>
  
  <p>this is my scripts task</p>
  
  <pre><code>gulp.task('scripts', function() {
  
      var bundler = browserify({
          entries: ['./src/scripts/main.js'],
          debug: debug
      }).transform(stringify()); // the error persist even without this transformation
  
      bundler
          .bundle()
          .on('error', handleErrors)
          .pipe(source(getBundleName() + '.js'))
          .pipe(jshint())
          .pipe(jshint.reporter('default', { verbose: true }))
          .pipe(jshint.reporter('fail'))
          .pipe(buffer())
          .pipe(sourcemaps.init({loadMaps: true}))
          .pipe(uglify())
          .pipe(sourcemaps.write('./'))
          .pipe(gulp.dest('./web/js'));
  });
  </code></pre>