…ing"

This reverts commit 87db631.

Getting recent changes from scikit-learn people.

…ons.

I thought they were working before.  Maybe I ran the wrong tests or
something.

…klearn and to work with gen_rst

1. Added allow_linear argument
2. Fixed a bug in the way endspan argument was processed
3. Fixed a bug in the way sample_weights were being applied
4. Added simple test case for 3 (test needs to be improved, may be
platform dependent)
5. Fixed a typo where min_search_points was accidentally
min_searh_points

Earth