title: R package "xgboost" installation fails
body: <p>I try to install the <code>xgboost</code> package. But I stumble upon this error </p>
  
  <pre><code>* installing *source* package 'xgboost' ...
  ** libs
  Warning: running command 'make -f "Makevars.win" -f "C:/PROGRA~1/R/R-32~1.0/etc/i386/Makeconf" -f "C:/PROGRA~1/R/R-32~1.0/share/make/winshlib.mk" SHLIB_LDFLAGS='$(SHLIB_CXXLDFLAGS)' SHLIB_LD='$(SHLIB_CXXLD)' SHLIB="xgboost.dll" ' had status 127
  ERROR: compilation failed for package 'xgboost'
  * removing 'C:/Users/mancph01/Documents/R/win-library/3.2/xgboost'
  Error: Command failed (1)
  </code></pre>
  
  <p>I try to install this package from github with this command </p>
  
  <pre><code>devtools::install_github('dmlc/xgboost',subdir='R-package')
  </code></pre>