added constructors for LogDetEstimator
added constructors LogDetEstimator,unit tests for those and added get methods for private variables of LogDetEstimator
fixed typos in #1940
added docs to #1940, unneccesary data from unit tests
removed constructor for dense matrix
fix failing input error in logdet notebook
Merge pull request #1968 from lambday/develop

fix failing input error in logdet notebook
Merge pull request #1940 from sunil1337/develop

added constructors for LogDetEstimator
remove german umlaut
Issue #1955; change loglevel through environment variable
fixes #1955; added a function init_from_env
fixes #1955; minor change
Merge pull request #1965 from dhruv13J/develop

Issue #1955; change loglevel through environment variable
Merge branch 'develop' of https://github.com/shogun-toolbox/shogun into feature/1868
renamed evaluate script
saving and loading from svmlight (no hdf5)