imporvemnt in simultraj
pep8 imporevement
new default simultraj file
- add device class
Merge branch 'master' of github.com:pylayers/pylayers

Conflicts:
	pylayers/mobility/trajectory.py
Merge branch 'master' of github.com:pylayers/pylayers
update docstring in link
add ls method
-imporvement in standards (power and ls method)
-Device class