Added new required headers for adding columns. 
Added new required headers for adding columns. 
zhengzhihust/tablib,enzochiau/tablib,mloesch/tablib,screwt/tablib,bopo/tablib,klothe/tablib,alex/tablib,whix/tablib,steveb/tablib,tommyanthony/tablib,screwt/tablib,bopo/tablib,steveb/tablib,klothe/tablib,whix/tablib,godfreyy/tablib,leohmoraes/tablib,enzochiau/tablib,kennethreitz/tablib,godfreyy/tablib,durden/tablib,zhengzhihust/tablib,leohmoraes/tablib,mloesch/tablib