Add support for loading winiks from disk

[ThomasThelen]

We should add support to the winik_manager manager class for loading pre-defined winiks and populating the manager with them. The file that's being loaded will most likely be a CSV file where each row represents a new winik.

load()

The pseudo-code for this method looks like

initial_winik_file <- read.csv('winiks.csv)
for (line in initial_winik_file) {
   new_winik <- winik$new(name=line$name, father_id=line$father_id, .....)
   self$add(new_winik)

The file will look something like