add bing to author list

README.md

@@ -2,9 +2,10 @@ xgboost: eXtreme Gradient Boosting
 =======
 An optimized general purpose gradient boosting (tree) library.
 
-Authors:
+Contributors:
 * Tianqi Chen, project creater
 * Kailong Chen, contributes regression module
+* Bing Xu, contributes python interface, higgs example
 
 Turorial and Documentation: https://github.com/tqchen/xgboost/wiki
  

python/xgboost.py

@@ -1,3 +1,4 @@
+# Author: Tianqi Chen, Bing Xu
 # module for xgboost
 import ctypes 
 import os

python/xgboost_python.cpp

@@ -1,3 +1,4 @@
+// implementations in ctypes
 #include "xgboost_python.h"
 #include "../regrank/xgboost_regrank.h"
 #include "../regrank/xgboost_regrank_data.h"

python/xgboost_python.h

@@ -1,7 +1,8 @@
 #ifndef XGBOOST_PYTHON_H
 #define XGBOOST_PYTHON_H
 /*!
- * \file xgboost_regrank_data.h
+ * \file xgboost_python.h
+ * \author Tianqi Chen
  * \brief python wrapper for xgboost, using ctypes, 
  *        hides everything behind functions
  *      use c style interface