Update dependencies in examples and bring them up to date

[nateps]

• Update dependency versions used in server. Old version of ws has security vulnerabilities and we don't want people copying the old version
• Use ReconnectingWebSocket in all examples so we demonstrate reconnecting by default
• React 0.15 => 0.16 and update to more current es6 class style components
• Use express consistently in all examples

[coveralls]

Coverage remained the same at 96.69% when pulling 6142102 on update-examples into 277be09 on master.

[ericyhwang]

Did you intentionally leave this as a function to serve as an example of ES5 syntax, instead of converting it to a class like the examples higher up?

Though if it's to serve as an ES5 example, you can't use object destructuring (line 7) and spread syntax (line 14, though that might be ok if React has its own JS expression parser for template strings).

[nateps]

Using just a function is how you write "stateless components" in React. In the docs they refer to it as function and class components: https://reactjs.org/docs/components-and-props.html

Here's another link about it: https://dev.to/mcarpenter/react---stateless-vs-stateful-components--5c3m

[ericyhwang]

Same here, was leaving this a function intentional?