Help needed with bug in quicker_sort

[Stéfan van der Walt]

Hi everyone

We are almost ready to release 0.10, but a serious blocker is that
quicker_sort segfaults under OSX.  If there is anyone here with the
necessary know-how to track this down, please get in touch.  I can
provide you with shell access on an OSX machine if that would help.
Please see

https://github.com/scikit-image/scikit-image/issues/835

Thanks
Stéfan