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
remove class Ray2d
Merge branch 'inter' of https://github.com/niamiot/pylayers into niamiot
calculation of 2x2 matrix M
Merge remote-tracking branch 'bernard/devel' into inter2

Conflicts:
	pylayers/antprop/rays.py
1st time ever full python raytracing
remains some bugs...