fix imports
Merge branch 'master' of https://github.com/berndbischl/mlr

Conflicts:
	DESCRIPTION
	R/RLearner_classif_glmboost.R
clean up - follow up (sry)
remove S4 method stuff
fixed xgboost tests
updated travis notifications
remove mlrMBO from suggests -- not on cran yet
updated docs for resample
ResampleResult object and doc fixes
fixes #195
updated NEWS
fixed some checks
fixed test / mock learner
put all methods for WrappedModel in that file and introduce new base class EnsembleHomogeneous
rename EH->HE
cleanup
fixed typo
try to fix MM
clean up
clean up
further refactor branch with homog. ens.