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* fix early stopping edge case

* fix message.

* fix tests

* fix GPU tests.

* add code for refit tree

* add implementation.

* update documents.

* clean code

* fix a type

AMD website recently Switched to HTTPS, which makes the previous downloading script failure. This commit fixes this issue and all GPU tests pass now.

* add try/except to __del__

* specify AttributeError

* Add n_estimators as num_iteration alias

Scikit-Learn's ensemble methods use the term `n_estimators` for the number of
iterations of training models. To make it more accessible for newcomers who are
familiar with Scikit-Learn, it would help if the Parameters page mentioned
`n_estimators` and what parameter that maps to within LightGBM's API.

Addresses discussion brought up in #954

* Add n_estimators as num_iterations alias

Adds n_estimators as an alias for num_iterations in the CLI as well as Python
libs. Additionally bumps the default for n_estimators in the Sklearn API to 100
estimators.

* fix feature fraction

* fix bugs.

* 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

* remove protobuf

* add version number

* remove pmml script

* use float for split gain

* fix warnings

* refine the read model logic of gbdt

* fix compile error

* improve decode speed

* fix some bugs

* fix double accuracy problem

* fix bug

* multi-thread save model

* speed up save model to string

* parallel save/load model

* fix some warnings.

* fix warnings.

* fix a bug

* remove debug output

* fix doc

* fix max_bin warning in tests.

* fix max_bin warning

* fix pylint

* clean code for stringToArray

* clean code for TToString

* remove max_bin

* replace "class" with typename

* use int64 for string

* [R] Fatal when CSC exceed int32.max

* updated Quick-Strat according to last changes in Parameters

* fixed links