0.7.0

• Router component now waits for async components (via react-async) before
  updating itself

• remove Hash namespace, use hash prop instead:

  ...

• RouterMixin now doesn't access this.props.children directly but instead gets
  routes via getRoutes() method

• rework NavigatableMixin: add getPath(), navigate(path, cb), makeHref(path)
  methods, remove getRouter() method

• add AsyncRouteRenderingMixin

• add RouteRenderingMixin

• Link components now generate valid href when instantiated inside contextual
  routers

• Link components now accept global prop to create a link which is forced to
  operate outside of a local router's context