"tap interface not implemented on this platform"

I get:

```
./gohop server.ini 
[16-07-29 05:04:04][INFO] using config file: %v server.ini
[16-07-29 05:04:04][ERROR] tap interface not implemented on this platform
```

on MacOS but I see:

```
commit e68425556224a9d474b02790b21a4eeaa956ac6c
Author: ox0spy <ox0spy@gmail.com>
Date:   Fri Feb 12 10:32:32 2016 -0800

    run gohop on Mac OS.
```

so I think this can run on this platform now right?
