Merge pull request #51 from tqchen/unity

merge unity into master, R package ready
Update README.md
modification of higgs-pred.R
Update README.md
Update README.md
Update DESCRIPTION
Delete LICENSE
Update DESCRIPTION
ignore csv
Merge branch 'master' of https://github.com/tqchen/xgboost
remove default value for nrounds
hide xgb.Boost
add documentation notes
get a pass in function docstring
chg
OK
compile Rd files, i.e. R documents
fix NAMESPACE
fix
pass pedantic