Hard hang of miner hangs webgui.

Reopen #38 - whatever was happening in sgminer did not happen until now, but captured the following error from the phpminer_rpclcient screen:

```
PHP Warning:  socket_recv(): unable to read from socket [11]: Resource temporarily unavailable in /var/www/phpminer/phpminer_rpcclient/includes/RPCClientConnection.class.php on line 182
```

Hope that helps!
