Add python version option to dev_setup.sh (#1952)
Add python version option to dev_setup.sh (#1952)

-p arg or --python arg allows the user to select which installed python version is used in the mycroft virtualenv.
MycroftAI/mycroft-core,MycroftAI/mycroft-core,forslund/mycroft-core,Dark5ide/mycroft-core,forslund/mycroft-core,Dark5ide/mycroft-core