Upgrading packages and fixing type issues

[krainboltgreene]

So I wanted to make some modifications to the library, but I found it was quite out of date. I attempted to update a few things:

1. jest now has a codified way to deal with typescript, via babel
2. I made the gitignore a little more sane
3. I updated all the packages I could, the devDependencies having no issues
4. Removed the unused @types/archiver

Here's some things I ran across:

1. postcss, camelcase, and postcss-selector-parser all have type definitions
   - postcss-selector-parser doesn't export theirs (Not exposing types? postcss/postcss-selector-parser#235), so I tried (and failed) to do it myself locally
2. All three libraries have changed how they expose themselves to imports, so I corrected as much as I could
3. Some of the types no longer make sense (Node -> AnyNode)
4. I was completely unable to figure out how exactly they changed the Stringify/builder stuff, but they did and now it no longer works.

[krainboltgreene]

The much more correct #17 is passing tests.