different variable names in files which leads to bugs

Hello !

- While trying to use counterfit, more specifically the 'new' command, i get the following error : 'EXCEPTION of type 'AttributeError' occurred with message: type object 'Config' has no attribute 'targets_path'', which is due to a variable being named targets_dir in '/examples/terminal/core/config', while being referred to as targets_path in 'examples/terminal/commands/new.py'. I wanted to point it out as it might be the case in other files and saw no mention of it anywhere.

- Whenever i try to run the "predict" command, i get the following error message : "EXCEPTION of type 'FileNotFoundError' occurred with message: [Errno 2] No such file or directory: 'counterfit/targets'", while everything else seems to work... I don't know if it's a setup problem or a path problem. Even when i follow the available demos step by step.

- I also think the MNIST tuto available in the wiki doesn't work anymore ?