fix compilation on mac
try to fix compile bug
fix
Merge pull request #39 from tqchen/unity

fix mac compile issue
refactor grad stats to be like visitor
templatize refresher
Merge pull request #41 from tqchen/unity

Unity
add set leaf, constructor of tstats now rely on param
tstats now depend on param
chg higgs back
move ncol, row to booster, add set/get uint info
Merge pull request #42 from tqchen/unity

Unity this is final minor change in data structure
add changes
Merge pull request #43 from tqchen/unity

add changes that are not commited
clean up warnings from msvc
changes
fix line from auto spacing by msvc
fix by giulio
better error handling
initial trial package