Merge pull request #1264 from khotilov/r_callbacks

[R-package] callbacks per #892

R-package/DESCRIPTION

@@ -4,7 +4,7 @@ Title: Extreme Gradient Boosting
 Version: 0.4-3
 Date: 2015-08-01
 Author: Tianqi Chen <tianqi.tchen@gmail.com>, Tong He <hetong007@gmail.com>,
-    Michael Benesty <michael@benesty.fr>
+    Michael Benesty <michael@benesty.fr>, Vadim Khotilovich <khotilovich@gmail.com>
 Maintainer: Tong He <hetong007@gmail.com>
 Description: Extreme Gradient Boosting, which is an efficient implementation
     of gradient boosting framework. This package is its R interface. The package

R-package/NAMESPACE

@@ -12,8 +12,16 @@ S3method(slice,xgb.DMatrix)
 export("xgb.attr<-")
 export("xgb.attributes<-")
 export("xgb.parameters<-")
+export(cb.cv.predict)
+export(cb.early.stop)
+export(cb.evaluation.log)
+export(cb.print.evaluation)
+export(cb.reset.parameters)
+export(cb.save.model)
 export(getinfo)
+export(print.xgb.Booster)
 export(print.xgb.DMatrix)
+export(print.xgb.cv.synchronous)
 export(setinfo)
 export(slice)
 export(xgb.DMatrix)
@@ -44,13 +52,13 @@ importFrom(Matrix,sparseVector)
 importFrom(data.table,":=")
 importFrom(data.table,as.data.table)
 importFrom(data.table,data.table)
-importFrom(data.table,fread)
 importFrom(data.table,rbindlist)
 importFrom(data.table,setnames)
 importFrom(magrittr,"%>%")
 importFrom(stringr,str_detect)
 importFrom(stringr,str_extract)
-importFrom(stringr,str_extract_all)
 importFrom(stringr,str_match)
 importFrom(stringr,str_replace)
+importFrom(stringr,str_replace_all)
 importFrom(stringr,str_split)
+useDynLib(xgboost)