VLOG -> PS_VLOG in van.cc
VLOG -> PS_VLOG in van.cc

shilad/ps-lite,xcgoner/ps-lite-new,dmlc/ps-lite,shilad/ps-lite,xcgoner/ps-lite-new,xcgoner/ps-lite-new,dmlc/ps-lite,shilad/ps-lite,dmlc/ps-lite,dmlc/ps-lite,xcgoner/ps-lite-new