thread speed not shown
Only the total speed is shown with scrypt :

```
[2014-08-02 04:48:24] thread 0: 90000 hashes, 0.00 khash/s
[2014-08-02 04:48:24] thread 1: 90024 hashes, 0.00 khash/s
[2014-08-02 04:48:24] thread 2: 90144 hashes, 0.00 khash/s
[2014-08-02 04:48:24] thread 3: 89664 hashes, 0.00 khash/s
[2014-08-02 04:48:24] Total: 72.37 khash/s
```

Should be :

```
[2014-08-02 04:51:21] thread 2: 62400 hashes, 17.99 khash/s
[2014-08-02 04:51:21] thread 3: 62568 hashes, 18.04 khash/s
[2014-08-02 04:51:21] thread 0: 62424 hashes, 18.00 khash/s
[2014-08-02 04:51:25] thread 1: 69408 hashes, 18.05 khash/s
[2014-08-02 04:51:25] accepted: 25/25 (100.00%), 72.09 khash/s (yay!!!)
```
