v6.8.0

We're now up to par with choo v6.8.0! Many of the features in 6.7.0 and 6.8.0 were routing-related so this actually a very small release.

Changes

• Allows using app.mount(selector) when server rendering, exposing the target selector as app.selector for templating
• Exposes .emit as an alias to .emitter.emit