Feature/fix spacings (add more accurate and tested conversion of margin/padding)

[benno5020]

Sorry for opening another pull request, I mistakenly sent my first one from my master branch, thinking it would be my only contribution.

Original message:

Hey there! First of all, thank you for writing this tool!

Let me also preface this by mentioning that I am just starting out with tailwind, so excuse me if I'm fixing something that's not actually broken.

The problem:

When I converted my bootstrap project to tailwind, I noticed that tailwindo 'py-lg-0' returned Converted Code: 'lg:py-2'. This didn't seem correct, 'lg:py-0' was expected.

I was tempted to just open an issue but then curiosity got the better of me and I tried fixing it myself.

What I have done to fix it:

• Since bootstrap's spacing steps are a little awkward to code arithmetically, I went with a new $spacings array.
• I also combined the string generation for padding and margin by looping through $spacingProperties = ['p', 'm'];
• My code is backed up with (probably too many?) tests inside a new Bootstrap folder, so it's easier for you to check the results.

Hope this helps 🙂

[abdumu]

Thanks.