use ~ in require and import calls

You must install squigly with a ~ alias which the usage below illustrates, otherwise the script won't run properly!

npm install '~@https://github.com/kolodny/squigly#42783ea5' --save-dev

This module lets you turn things like require('../../../../foo') into something like
require('~/foo'). The way it works is that on postinstall it replaces the ~ folder to point to the root of the project such that app/node_modules/~ will point to app/