Restructuring 2 - Add Utility functions and Run all Tests

[kartikdutt18]

This PR is transferred from #8, Since FFN weights some time cause invalid memory access which seems related to mlpack/mlpack#2314. So I am adding utility function to unzip files here and I'll continue working on image dataloader and then we can get back to the LeNet model. I hope this makes sense. This PR provides the following :

1. Unzip Utility Function.
2. Some bug fixes.
3. Runs all tests. (Probably we should get mnist_test/train in mnist.tar.gz since mnist test and train are fixed).
4. ListDir Utility function.

Looking forward to your suggestions. Regards.

CC: @KimSangYeon-DGU

[kartikdutt18]

This works on windows too now, Cleaning commits and outputs.

[zoq]

(Probably we should get mnist_test/train in mnist.tar.gz since mnist test and train are fixed).

Sure, we can do that, is there anything else you like to add here, this looks pretty good to me.

[kartikdutt18]

Sure, we can do that, is there anything else you like to add here, this looks pretty good to me.

I am done with this PR from my side aside from placing mnist_train/test in mnist.tar.gz. If this makes sense I'll ask on the IRC once I incorporate all suggestions.

[zoq]

Makes sense to me.

[KimSangYeon-DGU]

Looks good to me as well, please let us know if this is ready to go :)

[kartikdutt18]

This is ready from my side. Just tested it everything works fine. I think the builds will result in the same output. Regards.

[kartikdutt18]

Sorry pushed in the wrong branch, reverting now. Fixed now.

[kartikdutt18]

Great. Thanks a lot for the reviews.

[KimSangYeon-DGU]

Thanks! @kartikdutt18 👍

[kartikdutt18]

Thanks @KimSangYeon-DGU, @zoq for the reviews and all the help.