few modifications in algebraic.py
few modifications in algebraic.py
fixing bugs in location/algebraic.py
Merge branch 'master' of https://github.com/mlaaraie/pylayers into mlaaraie-master

Conflicts:
	doc/_static/default_wav.png
	doc/_static/doadod.png
	doc/_static/simple_impulse.png
Merge branch 'master' of https://github.com/pylayers/pylayers