Add flag to allow running dev_setup.sh as root
Add flag to allow running dev_setup.sh as root

====  Tech Notes ====
Added flag --allow-root to circumvent the requirement to run ./dev_setup
as a non-root user.
Also added help section

linuxipho/mycroft-core,aatchison/mycroft-core,Dark5ide/mycroft-core,forslund/mycroft-core,Dark5ide/mycroft-core,MycroftAI/mycroft-core,aatchison/mycroft-core,MycroftAI/mycroft-core,linuxipho/mycroft-core,forslund/mycroft-core