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* support travis osx

* add task=pip

* add osx task=pip

* fix gpu build

* add if-else task

* fix if-else task

eval_at has been broken after e465f92a.
This commit will fix eval_at.

* add make command to the python package.

* Update README.rst

* Update README.rst

* Update README.rst

* fix tests.

* fix unix build

* update readme

* fix setup.py

* update travis

* Update .travis.yml

* Update test.py

* some fixes.

* check the 64-bit python

* fix build.

* refine MANIFEST.in

* update Manifest.in

* add more build options.

* Add fatal in cmake

* fix a endif.

* fix bugs.

* fix pep8

* add test for the pip package build

* add test pip install in travis.

* fix version with pre-compile dll

* fix readme.rst

* update readme

Minor typo in comments

* add appveyor

* add nuget and artifacts

* Update appveyor.yml

* remove python27 test

* handle list for prediction

* fix error msg

* avoid threshold inf

* use __save_model_to_string for feature importance

* Revert "use __save_model_to_string for feature importance"

This reverts commit dca6a85fb3d89866eb56eb0c9ca103ada4d92b53.

* Fixes #610

* Not force user to install VS Runtime if VS installed

* Fix Visual Studio version solutions

* Remove paste0 ambiguity for paths

* Fix equal missing typo

* Get rid of all trailing slashes

Close #595

This commit will regain backward compatibility that has been broken
after e465f92a.

* readme Helper package for R-package installation

* Fix code indentation bug

* Add warning about default compiler in Windows

* Avoid repeat

* Add Rtools requirement

* Wording to promote VS as default choice for user