Test failures in graph subpackage

[Josh Warner]

I think I found the problem.

Originally, these tests all passed on OSX, Win7, and Scientific Linux. 
 Then I looked into what versions Travis was installing, and the only 
package newer than what I was running was Cython 0.19.

So upgraded Cython to 0.19 using pip (installed with no errors; had 0.17 or 
0.18 previously) with no other changes in my config. Then after `$ make 
clean`, rebuilt scikit-image inplace, and `$ make install` I can reproduce 
these failures on Scientific Linux.

I renamed and kept the old _mcp.c file to compare with the new version; if 
that diff is potentially of interest I can post it or the full file(s) on 
pastebin or a gist.

Josh

On Saturday, April 20, 2013 3:32:16 PM UTC-5, Tony S Yu wrote:
>
> Can anyone reproduce the test failures that the Travis buildbot is raising 
> on master:
>
> https://travis-ci.org/scikit-image/scikit-image/jobs/6472929#L2274
>
> The tests pass on my setup, so I can't really figure out what's wrong.
>
> Thanks,
> -Tony
>
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