Add random_motor to Environment and clean it
Fix an important bug in simple arm
The last segment was not the good size. Modify HD configurations in
consequence.
clean pendulum and other little stuffs
Improve learning curve plots (axes and labels)
remove n_bootstap from experiement
Merge branch 'master' of github.com:flowersteam/explauto

Conflicts:
	explauto/environment/pendulum/pendulum.py