Multiple concat tasks

Script tasks like 

```
a.js + 
b.js + 
c.js ==> 
      new1.js        // just combile
      new1.min.js    // combile and minify

d.js + 
e.js +
f.js ==>
     new2.js        // just combile
     new2.min.js    // combile and minify

g.js + 
h.js +
i.js ==>
     new3.js        // just combile
     new3.min.js    // combile and minify
```

Is there a way I can do all these in on task?
