Factored draw code and constants to separate modules

Moved flatris.js into new src folder

Added webpack + babel transpiling, current build for serving

Fixed bug with game restart not clearing board + score

Updated page title

Added messages for game start and game over

Added game end state

Added scoring and score rendering

Removed all lambdas that were defined in loops

Added collision detection & x-position adjustment on piece rotation

Replaced vars with lets, because es6

Added jshint config for ES6 linting

Added standard nodejs gitignore

Updated package.json to match current version of project

Renamed main js module to match repo name