Add travis & coverage & landscape for CI + FIX several backport bugs

Update readme to display badges

FIX travis.yml re-using scikit-learn CI tools

FIX travis error on ubuntu

FIX test random_output_trees and not scikit-learn

Request for sufficiently hgih scikit-learn version

Omit ubuntu for now

Try to fix package versoin

Specify numpy version

FIX sklearn install

Specify scipy

FIX import

Try to fix travis

Try to fix travis build

Avoid uninstalling not installed package

ENH use backport check_X_y

Improve setup.py

Try to fix travis failure

Try to diagnose travis failure

Big work to make everything pass

Remove code present only in dev of sklearn

Backport more stuff from sklearn

Backport more stuff

Simplify tests

Specify indx for format

FIX more bugs / backport mistake

Avoid assert_greater_equal

COSMIT

FIX missing change