Fixed nasty bug in Chartist.extend where object properties were modified in source during merge
Fixed nasty bug in Chartist.extend where object properties were modified in source during merge

hansmaad/chartist-js,hansmaad/chartist-js,chartist-js/chartist,gionkunz/chartist-js,cr3ative/chartist-js,gionkunz/chartist-js,chartist-js/chartist,cr3ative/chartist-js,chartist-js/chartist