add new eslint rules and fix errors

[debuggy]

1. Currently just add src folder in linter rules (not including test cause some unhandled issues)
2. Use standard + prettier eslint plugins, some important rules:

  semi: true,
  // Trailing commas help with git merging and conflict resolution
  trailingComma: 'all',
  // Use single quote in all files. https://github.com/prettier/prettier/issues/1080#issuecomment-390363232
  singleQuote: true

3. Need a overall api test to ensure the compatibility
4. Update nodejs version to dubnium (node 10) cause some packages do not support node 8

[coveralls]

Coverage increased (+0.009%) to 34.837% when pulling adff80f on linter into ff57442 on master.