FreeImage binaries

[Zachary Pincus]

> New idea -- it may be better to just try to load anything that starts with "FreeImage" or "libfreeimage" (non case-sensitive). This because I notice that the default OS X makefile produces "libfreeimage.3.15.1.dylib"...
> 
> This way the code will just try to load any matching file it finds, and if the loader complains then it'll move on to the next.

https://github.com/zachrahan/scikits-image/commit/77d2ae88b5519c3b521241ad5d081d86066bc034

This seems slightly more likely to work in more situations. I still need to test it rather more carefully though. But comments as to the general idea would be welcome.

Zach