covdet: adds demo
covdet: adds demo

j-bo/vlfeat,WangDequan/vlfeat,qubick/vlfeat,erexhepa/vlfeat,erexhepa/vlfeat,vlfeat/vlfeat,CansenJIANG/vlfeat,richarddzh/vlfeat,WangDequan/vlfeat,hongzhili/vlfeat,CansenJIANG/vlfeat,vlfeat/vlfeat,erexhepa/vlfeat,qubick/vlfeat,hongzhili/vlfeat,j-bo/vlfeat,rxl194/vlfeat,mylxiaoyi/vlfeat,cvfish/vlfeat,mylxiaoyi/vlfeat,CansenJIANG/vlfeat,cvfish/vlfeat,WangDequan/vlfeat,cvfish/vlfeat,CansenJIANG/vlfeat,WangDequan/vlfeat,richarddzh/vlfeat,vlfeat/vlfeat,qubick/vlfeat,mylxiaoyi/vlfeat,hongzhili/vlfeat,rxl194/vlfeat,CansenJIANG/vlfeat,j-bo/vlfeat,erexhepa/vlfeat,hongzhili/vlfeat,hongzhili/vlfeat,erexhepa/vlfeat,mylxiaoyi/vlfeat,richarddzh/vlfeat,richarddzh/vlfeat,j-bo/vlfeat,qubick/vlfeat,WangDequan/vlfeat,cvfish/vlfeat,richarddzh/vlfeat,vlfeat/vlfeat,richarddzh/vlfeat,erexhepa/vlfeat,rxl194/vlfeat,rxl194/vlfeat,mylxiaoyi/vlfeat,qubick/vlfeat,vlfeat/vlfeat,vlfeat/vlfeat,cvfish/vlfeat,j-bo/vlfeat,rxl194/vlfeat,rxl194/vlfeat,CansenJIANG/vlfeat,qubick/vlfeat,cvfish/vlfeat,mylxiaoyi/vlfeat,WangDequan/vlfeat,hongzhili/vlfeat