vl_setup.m: avoids adding a directory that does not exist
vl_setup.m: avoids adding a directory that does not exist

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