make datasets be downloaded instead of read to save cargo space

forgot to update the version

make a small adjustment on the way the batches are selected and created

fix a bug wit the mini-batch stochastich gradient descent and preproc…

…essing

Merge pull request #6 from gabrielmfern/preprocessing

add a way to preprocess inputs for the training options and the fit m…

update the intricate-macro version

Merge pull request #4 from gabrielmfern/feature/halting_condition

Feature/halting condition

Merge pull request #3 from gabrielmfern/v0.4.0

v0.4.0

delete unused sonar properties file

fix some problems that appeared after I resolved merge conflicts