Adjusted make_roc_curves to now take as many collections as you want.

The cost is now you cannot do offline in it, but that is what the
make_offline_reports is going to be for!
Made laplace smoothing a variable that you can change (since the 1
is actually arbitrary)
Added make_offline_reports, which also writes reports.
Unless, of course, I made a big bad bug. I wouldn't be surprised.