Use os.makedirs to create parent dirs for solution_fn #203
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Before this fix the tests fail cbc does not work on OSx.
On OSx mknod requires privledged access (need to run as sudo)
https://stackoverflow.com/questions/32115715/os-mknod-fails-on-macos, but even when running as sudo, the test still fails with an invalid argument error.
I assume the mknod is there incase the parent dir of the solution_fn is not present, so I created a test for this case and found that glpk also fails if the solution_fn's parent dir does not exist so I added a fix for this.