* Produce xgboost.so for XGBoost-R on Mac OSX, so that `make install` works * Modernize R build instructions * Fix crossref
The documentation of xgboost is generated with recommonmark and sphinx. You can build it locally by typing "make html" in this folder. Checkout https://recommonmark.readthedocs.org for guide on how to write markdown with extensions used in this doc, such as math formulas and table of content.