Add useful services to github project

[micgro42]

• travis,
• ESlint
  • Find way to have ESlint handle let correctly
  • https://github.com/sindresorhus/grunt-eslint
  • https://github.com/mozilla/addon-sdk/wiki/Coding-style-guide
  • ESlint and qunit: https://www.npmjs.com/package/eslint-plugin-qunit

[micgro42]

ESlint - es6:

{
    "env": {
        "browser": true,
        "commonjs": true,
        "es6": true
    },
    "extends": "eslint:recommended",
    "parserOptions": {
        "sourceType": "module"
    },
    "rules": {
        "indent": [
            "error",
            4
        ],
        "linebreak-style": [
            "error",
            "unix"
        ],
        "quotes": [
            "error",
            "single"
        ],
        "semi": [
            "error",
            "always"
        ]
    }
}