Feature/eslint improvements

[ghost]

Update on eslint and some overall code changes/fixes to reflect those changes:

"extends": [
    "eslint:recommended",
    "google",
    "plugin:vue/essential"
  ],
  "plugins": [
    "vue"
  ],
  "rules": {
    "quotes": ["error", "single"],
    "max-len": ["error", 120],
    "comma-dangle": "off",
    "key-spacing": "off",
    "object-curly-spacing": "off",
    "space-before-function-paren": "off",
    "valid-jsdoc": "warn",
    "require-jsdoc": "off",
    "no-console": "warn",
    "no-unused-vars": "warn",
    "no-invalid-this": "off",
    "no-multi-spaces": "off",
    "new-cap": "off",
    "camelcase": "warn"
  }

All the changes in src/ folder are simply adding the semicolon ; at the end (which was done automatically by eslint)

Core changes are simply on .eslintrc and package.json

[ghost]

@davidyuk

updates pushed.