* Build plugin example with CMake. * Remove plugin, cuda related code in automake & autoconf files. * Fix typo in GPU doc.
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.