fixing bug in bsignal
Merge branch 'master' of https://github.com/pylayers/pylayers
Merge branch 'master' of https://github.com/mmhedhbi/pylayers into body
 ras
Merge branch 'master' into body
body cylinder
ras
ras
add body.py
Merge branch 'master' of https://github.com/pylayers/pylayers into body

Conflicts:
	pylayers/signal/bsignal.py
fixing conflict in bsignal.py
update body class
commenting examples in body
modification in test_rays
Merge branch 'body'
Merge pull request #142 from mmhedhbi/master

Addition in mobility/body directory