Consider standard js coding standard

Coding standards can be hard to document and make everyone follow. Prompted by this tweet: https://twitter.com/HenrikJoreteg/status/741283595105402880 We should discuss following JavaScript Standard Style.

• 2 spaces – for indentation
• Single quotes for strings – except to avoid escaping
• No unused variables – this one catches tons of bugs!
• No semicolons – It's fine. Really!
• Never start a line with (, [, or `
  • This is the only gotcha with omitting semicolons – automatically checked for you!
  • More details
• Space after keywords if (condition) { ... }
• Space after function name function name (arg) { ... }
• Always use === instead of == – but obj == null is allowed to check null || undefined.
• Always handle the node.js err function parameter
• Always prefix browser globals with window – except document and navigator are okay
  • Prevents accidental use of poorly-named browser globals like open, length,
    event, and name.
• And more goodness – give standard a try today!

There are a few things I don't like but the point is that they're developing a set of tools to check style based on eslint, what we're using today. I see that there is already a Semi standard style. Currently we have a pretty strict eslint config we'd need to add some extra rules on top of the standard style to make sure people don't stray away from the coding standards.

Anyway, it's up for discussion.