Immutable.js's tools are behind the times and it is limiting progress on some of the top line goals.

This is a master task that details all the steps required to modernize the repository.

• move the source for gh-pages into master branch (Move pages source into main branch #741)
• automatically deploy gh-pages when master pages src changes (a71d9b6)
• use latest jest for tests
• use eslint for linting (eslint + prettier - jshint #1101)
• improve strictness of lint rules (eslint + prettier - jshint #1101)
• run tests against latest versions of node (a91b5e7)
• update to the latest version of typescript (Update to use latest version of typescript #745)
• use buble for ES6 -> ES3 compilation (Use bublé, remove Grunt #1102)
• remove usage of gulp in favor of npm scripts? (1b41669)
• remove usage of grunt in favor of npm scripts (1b41669) (Use bublé, remove Grunt #1102)
• include flow type definition file
• no longer check in distributed files (breaking change)
• move contrib to separate repository (breaking change)
• setup yarn (Setup yarn. #1100)
• setup prettier (eslint + prettier - jshint #1101)
• move documentation generator source of truth to flow type + babel. - Note, updated to latest TypeScript instead.