fix #26: 当调用UglifyJS.minify时，只把uglify-js需要的参数传进去，避免传入无用参数引起uglify-js报错。

这一fix版本使用了ES6语法，因而可能无法支持老版本Node。

lib/filter.js

@@ -81,7 +81,13 @@ function logic_js(str, data) {
         }
     }
 
-    var result = UglifyJS.minify(str, options);
+    const uglify_v3_allow_options = ["parse", "compress", "mangle", "output", "sourceMap", "nameCache", "toplevel", "warnings"]
+    const uglify_options = {}
+    for (let key of uglify_v3_allow_options) {
+        if (options[key] !== undefined) uglify_options[key] = options[key]
+    }
+
+    var result = UglifyJS.minify(str, uglify_options);
     if (!result.error) {
         var saved = (((str.length - result.code.length) / str.length) * 100).toFixed(2);
         if (options.logger) {
@@ -91,7 +97,7 @@ function logic_js(str, data) {
         var prefix = '// build time:' + Date().toLocaleString() + '\n';
         var end = '\n//rebuild by neat ';
         js_result = prefix + result.code + end;
-    }
+    } else throw result.error;
     return js_result;
 }