title: mingw32-make can not be found in environment variables
body: <p>I want to use install xgboost on my windows 7. but before that, when i installed MinGW-W64, it needed to use make command and when i type <code>which mingw32-make</code> in my git bash, it said that there is no <code>mingw32-make</code> in my Path ( although i gave an address for the directory of <code>mingw32-make</code> in the Path environment variable). So could someone help me with this or at least propose an easy way to use xgboost within ipython notebook?</p>
  
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