Roxygen2 updates, xgboost fixes

[ngreifer]

Hi Eric,

I took it upon myself to make some edits to the package since the xgboost update was creating some downstream issues for packages that depended on SuperLearner. I made the xgboost code conform to the newly release version of the package on CRAN. I also made some updates to the documentation so that everything is in Roxygen2. I tested it with R CMD check and it came up okay, but you might want to check it out for yourself before submitting it to CRAN. I would appreciate it if you could submit this to CRAN soon to ensure the packages that depend on SuperLearner can stay up.

Noah

[ecpolley]

Thanks Noah, I have an update in flight (had been working offline, just update Github today) with a backwards compatible fix for SL.xgboost. I'll take a look at the other edits (and also working on moving SL.xgboost from using xgboost to xgb.train)

[ecpolley]

xgboost update on CRAN now (had a hiccup with CLANG-ASAN error from the RandomForest package and had to modify some of the test scripts)