fix(join) uglify: exec.each -> exec.parallel

Author: coderaiser

lib/join.js

@@ -129,7 +129,17 @@
         });
     }
 
+    function retMinify(name) {
+        return minify.bind(null, name);
+    }
+    
     function uglify(names, callback) {
-        exec.each(names, minify, callback);
+        var funcs = {};
+        
+        names.forEach(function(name) {
+            funcs[name] = retMinify(name);
+        });
+        
+        exec.parallel(funcs, callback);
     }
 })();