Tensor improvements

[ersagunkuruca]

See: #37

• Changed tensors to mod 90
• Fixed broken Tensor.add function
• Changed decay function to make negative values possible

I was not sure about whether or not to include the updated build, so I did it in a separate commit.

[ersagunkuruca]

Apparently I am an idiot. I did something wrong at the last minute and didn't test it, now radials are all wrong.

[ProbableTrain]

I like it, I'll look into enforcing the road separation

[ProbableTrain]

@all-contributors please add @ersagunkuruca for code

[allcontributors[bot]]

@ProbableTrain

I've put up a pull request to add @ersagunkuruca! :tada: