Refactor all Javascript code (& Ruby)

[ribose-jeffreylau]

• Make sure all JS files adhere to warnings from JSHint(http://jshint.com/)

  • Put all JS code under a function scope where possible
    • Add 'use strict'; to all JS files

• Remove all redundant files / code

• Write tests for both JS and Ruby

  • Make sure JS specs cover as much code as possible

• Document where it makes sense

• Break up JS functions that are too large into more manageable chunks, etc.