Remove unnecessary functions
Add function to downsample an image
Change parameter passed to function

Change parameter passed to scale_array() to correct parameter
Change function return type

Function create data_sets() now returns a tuple containing the training
and test set
Fix downsample return type
Remove unused global variable
Change list to array
Split up a function into two functions
Remove unused import statement
Move some images from test to train
Add KNN classifier
Update function KNN
Add Random Forest classifier
Generalize results
Move images from train to test
Change threshold value
Merge branch 'learning' into develop