* Add conf.checkIPinIP

This setting, when set to False, will exclude IP layers which encapsulate
another IP layer from the checks to tell if a packet is an answer to
another one.

Fixes #383

* conf.checkIPinIP affects both IP() and IPv6()

Setting conf.checkIPinIP will handle IP()/IP(), IP()/IPv6(),
IPv6()/IP(), IPv6()/IPv6().

Thanks @guedou!

* Clean-up IP.hashret and .answers code

* Add tests for .hashret() and .answers()

* Support (BPF) filter in sniff() with offline parameter set

Fixes #393
Also, fixes #355

* Add tests for wrpcap() and sniff(offline=)

as suggested by Guillaume.

Also, cleanup regression.uts since it was a pain to find a place
to add those tests.

* Fix PATH for tcpdump with non-root user

* Do not run tcpdump tests when tcpdump is not available

* Appveyor tests: install WinDump.exe

Thanks @gpotter2

Added roadmap link

* [isis.py] Add support for some SubTLVs
* [isis.py, isis.uts] Fix, (unit-)test and extend SubTLVs support

Fixed the invalid copy_flag in some ip options

HTTP/2 support

Add AppVeyor badge

AppVeyor support

fix version when installing from git archive

[bug] fix issue with python-pcapy interface next() function 

[Windows] Fix autocompletion crash

[bug] fix issue with python-pcapy interface next() function not properly catching if next packet does not exist.

[Windows] Updated bin scripts

Return a correct exit code

Allow to set promisc mode in sndrcv().

Use special code path for OpenBSD in sndrcv.

In the pcapdnet() backend it was not possible to run the
L{2,3}{pcap,dnet}Socket in promiscuous mode.  Add a promisc option
to sr(), sr1(), srp(), srp1(), srflood(), srpflood() so that the
user can choose the behavior.

Keep the default non-promiscuous as in most cases sndrcv() sniffs
an answer that is directed to the sender.

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.

When installing from a git archive downloaded from github, the file
scapy/VERSION is not present since it is generated when building a
source archive with:

    ./setup.py sdist

To work around the problem, use the export-subst git attribute to make
git archive write the current revison information in scapy/__init__.py.

Signed-off-by: Robin Jarry <robin.jarry@6wind.com>

OS X Travis tests fixed

setup: add scapy.arch.bpf module