WIP: Replace simple dict with RegisteredFunction class.
Fixed typo that reversed enable and disable
Fixed two bugs and added outfile stuff.
WIP: Replace magic-number thresholds with constants. Not broken.
Use more numpy.
Lower good enough threshold -- float64 was the culprit.
WIP: Removed outfile stuff
WIP: Use shape to set upper bound.
Set Travis nosetests not to capture log -- won't matter for now