improve document format
eliminate warnings and notes from R CMD check
add back import of methdos
add import methods in NAMESPACE
remove pdf file
Update DESCRIPTION
fix print problem, fix Tong's email format
chg  data
add license name
check in description
Update DESCRIPTION
Update DESCRIPTION
move demo to inst/examples
final revision before CRAN
more clean makefile
add ignore
remove useless flag
Merge branch 'master' of ssh://github.com/tqchen/xgboost
change flagname to pass check
change windows