* Add travis sanitizers tests. * Add gcc-7 in Travis. * Add SANITIZER_PATH for CMake. * Enable sanitizer tests in Travis. * Fix memory leaks in tests. * Fix all memory leaks reported by Address Sanitizer. * tests/cpp/helpers.h/CreateDMatrix now returns raw pointer.
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.