Migrate code base to fully utilize Typescript

[ismail-syed]

• Converted all the .js files to .ts
• Added a build script to generate a dist directory with all the compiled tslint-config-shopify goodness in it
• Created a .npmignore file, primarily to ignore the ./src when publishing
• ./base.json, ./react.json, and ./untyped.json extend their configs from the ./dist directory
• Added a tslint.json

This is my first time doing this build step goodness stuff. Feel free to be pedantic with this review! :)

Also, can I get a 🎩 on this please.

[ismail-syed]

@GoodForOneFare Your comments have all been addressed. This is what the final package looks.