Upgrade uglify and simplify usage

- Upgrade to the most recent version of uglify
- Use the `UglifyJS.minify(code)` helper which does exactly what we want

package.json

@@ -21,7 +21,7 @@
     "winston": "0.6.2",
     "redis-url": "0.1.0",
     "redis": "0.8.1",
-    "uglify-js": "1.3.3",
+    "uglify-js": "3.1.6",
     "busboy": "0.2.4",
     "pg": "4.1.1"
   },

server.js

@@ -1,6 +1,7 @@
 var http = require('http');
 var fs = require('fs');
 
+var uglify = require('uglify-js');
 var winston = require('winston');
 var connect = require('connect');
 var route = require('connect-route');
@@ -54,19 +55,14 @@ else {
 
 // Compress the static javascript assets
 if (config.recompressStaticAssets) {
-  var jsp = require('uglify-js').parser;
-  var pro = require('uglify-js').uglify;
   var list = fs.readdirSync('./static');
   for (var j = 0; j < list.length; j++) {
     var item = list[j];
-    var orig_code, ast;
     if ((item.indexOf('.js') === item.length - 3) && (item.indexOf('.min.js') === -1)) {
       var dest = item.substring(0, item.length - 3) + '.min' + item.substring(item.length - 3);
-      orig_code = fs.readFileSync('./static/' + item, 'utf8');
-      ast = jsp.parse(orig_code);
-      ast = pro.ast_mangle(ast);
-      ast = pro.ast_squeeze(ast);
-      fs.writeFileSync('./static/' + dest, pro.gen_code(ast), 'utf8');
+      var orig_code = fs.readFileSync('./static/' + item, 'utf8');
+
+      fs.writeFileSync('./static/' + dest, uglify.minify(orig_code).code, 'utf8');
       winston.info('compressed ' + item + ' into ' + dest);
     }
   }