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* Revert "[ci] run all examples at Appveyor (#1432)"

This reverts commit d0088c55.

* Revert "[ci] simplified and speeded up Travis (#1429)"

This reverts commit 0a3d4de7.

* updated travis

* renamed OSX->macOS; updated gcc installation on macOS

* updated travis macos installation

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* updated installation guide for macos

* fixed spelling

* renamed appveyor file

* updated Travis

* added doc test

* fixed 404

* prevented maito: ref creation

* added rst structure test

* fixed unknown directives

* added code for the future check for html syntax

* replaced problem link

* disabled logs from compilers; fixed #874

* fixed safe clear_fplder

* added windows folder to manifest.in

* added windows folder to build

* added library path

* added compilation with MSBuild from .sln-file

* fixed unknown PlatformToolset returns exitcode 0

* hotfix

* updated Readme

* removed return

* added installation with mingw test to appveyor

* let's test appveyor with both VS 2015 and VS 2017; but MinGW isn't installed on VS 2017 image

* fixed built-in name 'file'

* simplified appveyor

* removed excess data_files

* fixed unreadable paths

* separated exceptions for cmake and mingw

* refactored silent_call

* don't create artifacts with VS 2015 and mingw

* be more precise with python versioning in Travis

* removed unnecessary if statement

* added classifiers for PyPI and python versions badge

* changed python version in travis

* added support of scikit-learn 0.18.x

* added more python versions to Travis

* added more python versions to Appveyor

* reduced number of tests in Travis

* Travis trick is not needed anymore

* attempt to fix according to https://github.com/Microsoft/LightGBM/pull/880#discussion_r137438856

* setup.py custom install & sdist

* global data_files

* fix install rule

* fix pylint

* clean codes

* use distutils.command

* overwrite install_lib

* add copy_files; fix pylint

* install openmpi only TASK=mpi

* add TASK=sdist & bdist

* setuptools.command instead of distutils

* add METHOD=pip for gpu test

* use openmpi to install gcc

* set OpenCL_INCLUDE_DIR & BOOST_ROOT

* update doc

* export BOOST_ROOT

* update doc

* update doc

* update doc

* support travis osx

* add task=pip

* add osx task=pip

* fix gpu build

* add if-else task

* fix if-else task