kfold: Added parameter checking, fixed an off-by-one and changed some variable names with the intention of making it more readable
Added missing tests to evaluation, they are basic, but better than nothing
Changed the precision interface to remove a redundant argument
- Fixed pickle-ability for classification problems that use @is_attribute
- Fixed an attribute ordering so classificators that rely on attribute vectors can be retrained with repeat-ability.
Merge branch 'develop' of https://github.com/simpleai-team/simpleai into adversarial-search