Support for ACS ACR1251U Reader

```
At the moment the ACS ACR1251U is not supported by LibNFC (only it's 
predecessor the ACS ACR122U is).

Is it possible add support for the ACS ACR1251U, and what information do i need 
to provide?


http://www.acs.com.hk/en/products/218/acr1251-usb-nfc-reader-ii/#tab_techspecs
```

Original issue reported on code.google.com by `collin.b...@gmail.com` on 13 Nov 2014 at 12:39
