GitLab

Conflicts:
	src/io/dataset.cpp

Improved consistency and wording of user-facing logs and documentation

Packages that parse LightGBM’s logs will require minor changes to
parsing logic to work correctly.

support init_score for multiclass classification (#62)

merge to dev

`error: 'exp' is not a member of 'std'
     rec[i] = std::exp(rec[i] - wmax);`