ENH: precompute X_argsorted when possible
DOC: X_argsorted
Flake8
P3K use six to have a python 2 & 3 compatible code base
P3K StringIO vs BytesIO
DOC fix failing doctest due to unicode_literals
Cosmit: more explicit xlabel.
Cosmit: more explicit label.
ENH: use isinstance instead
Merge pull request #1668 from glouppe/adaboost-tree

[MRG] Precompute X_argsorted in AdaBoost
DOC whitespace in doctest
BUG revert P3K changes that broke mldata tests
rm gender classification example

Accidentally committed in 1967a0b3236ab65e6a18d402753d344860d85b9c.
ENH get rid of imports in test_common by checking by names, not classes.
ENH fix test_estimators_overwrite_params to also test regressors and transformers. Then fix all the regressors and transformers ... meh!
ENH set the random state to avoid heisenfailures
COSMIT pep8, removing unused imports
P3K death to the print statement
P3K fix broken doctest and add forgotten print_function import
DOC no more need for compute_importances in trees

Prevents warning from doctest.