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This addresses #1127. It seems that scipy optimize returns nans instead of -1 on Windows, for non-converging inputs. This converts these nan results into the expected all
-1
.See try_branch here: http://nipy.bic.berkeley.edu/builders/dipy-bdist64-35-win2016/builds/42/steps/shell_11/logs/stdio
Fixed plenty of PEP8 violations while I was at it.