mkdir was linux specific changed to os.makedir so it is supported by all os.
mkdir was linux specific changed to os.makedir so it is supported by all os.

rlpy/rlpy,MDPvis/rlpy,BerkeleyAutomation/rlpy,BerkeleyAutomation/rlpy,silgon/rlpy,imanolarrieta/RL,imanolarrieta/RL,imanolarrieta/RL,rlpy/rlpy,MDPvis/rlpy,BerkeleyAutomation/rlpy,silgon/rlpy,MDPvis/rlpy,silgon/rlpy,rlpy/rlpy