* skip in-search-space check for small max iter
* resolve Pickle Transformer #730
* resolve default config unrecognized #784
* Change definition of init_config
* copy points_to_evaluate
* make test pass
* check learner selector
* categorical choice can be ordered or unordered
* ordered -> order
* move choice into utils
* version comparison
* packaging -> setuptools
* import version
* version_parse
* test order for choice
* refactoring TransformersEstimator to support default and custom_hp
* handling starting_points not in search space
* addressing starting point more than max_iter
* fixing upper < lower bug