Fixed problem with sample_weight (issue #50)
Recompiled (change to white space and line numbers in _forward.c)
Added test for issue #50, added new allow_linear parameter, fixed issue #51, fixed a typo in min_search_points
Changed the issue #50 test case
Merge pull request #52 from jcrudy/weights_bug

Fixed issues #50 (sample_weight bug) and #51 (endspan bug); fixed min_search_points; added allow_linear