#686 - update skill should only update unchanged skills
#686 - update skill should only update unchanged skills

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