Reworked how results are reported in randomized trials (and thus the way randomize_parameters works). I've switched it all over to returning json instead of comma separated values. It would be really easy from this point to allow an option to output csv (as an option), but for now I'll leave it out. The reasoning behind this is that this way when running large experiments you really don't need to keep track of exactly what parameters were in which column for what algorithm, etc. Its all right there in the json. This results in a bit of extra text being stored, which if you do a large (1million) parameter search adds up (I estimated it at about 460mb for 1mil. parameters/results). But, this can easily be side stepped by gzipping the resulting json files (which compress very nicely).