cert.py improvements

* Improve cert.py : independence from openssl, ECDSA support, sign/verify capabilities

* Make travis install python-ecdsa

* Clarify ECDSA support

* Cleaning up for cert.py

Fix support and add test for ASN.1 (unknown) high-tag-number

Fix scapy init when gtk is not available

matplotlib.pyplot inits gtk, which may not be available.
If so, handles this as if the import failed.

Use IPv6 source and destination addresses in hashret()

IPv4 mDNS support

Simple pipe example

EAPOL / EAP updates and regression tests

Missing import in packet.py

OS X installation methods updated

In show() and show2() add  the "dump" argument to return the packet representation

Add support for CoAP

layers/bluetooth.py Added New Packets and Bug Fix

Adding TCP Fast Open support.

* Flip conditional for simplicity
* Indent lines
* Include Travis CI build status image & link

Added new packet types for SM and 128bit UUID Read by Type. Also added check in send command for BT socket that makes sure the type is of an event packet before looking for the code value to prevent periodic crashes when sending commands

Run unit tests on Linux and OS X - root and non-root

In Packet.show() and Packet.show2() add the "dump" argument to return the packet representation instead of printing it.

For example : print pkt.show(dump=True)

Add also 'indent', 'lvl' and 'label_lvl' arguments to show2() to be consistent with show().

Traceroute: fix graph

Move notebook to correct location

Scapy notebook tutorial

HomePlugAVuts fixed

Packet.copy(): copy the `time` property