Use special code path for OpenBSD in sndrcv.

On OpenBSD use the non-blocking recv() after select() in sndrcv().
That was already done for FreeBSD and Darwin.  This fixes sniffing
on real hardware with libdnet backend.

OS X Travis tests fixed

setup: add scapy.arch.bpf module

Use socket.pton & socket.ntop is available

UDP checksum computation fixed

Typo fixed

Fix broken import on Windows

Add SSLStreamSocket

Add dump option to [line|c]hexdump to get the result in a variable

Fix .trace3D()

improve installation doc regarding OpenBSD

Python files spell checked

ASN.1 enhancements

Replace IPSec with IPsec

Fix ICMPv6MLQuery().hashret()

Fixed priting tiny bug

Added PAUSE when scapy crashes (to see error code), so the cmd won't
close itself

Travis CI: fix install & tests

Stop sniff() on empty s.recv()

- improved from Mattias Ahlbäck original patch

Add ASN.1 Gauge32 support

* Some new Windows links

Replaced links for PyWin32, Winpcap, pyreadline

* Update compatibility.py