Fixing critical bug for properly handling antenna in channel.py
change in antenna
Merge branch 'master' of https://github.com/pylayers/pylayers

Conflicts:
	pylayers/antprop/channel.py
Merge branch 'master' of https://github.com/pylayers/pylayers
Merge branch 'master' of https://github.com/pylayers/pylayers
add notebook on body
modif in notebook
Merge branch 'master' of https://github.com/pylayers/pylayers