Have a default implementation for all Matcher methods besides matches(Object)

[peterdemaeyer]

Whenever one implements Matcher, one has to implement at least two methods: matches(Object) and describeTo(Description description). It would be vastly more intuitive if there was a default implementation for the latter. Then one could implement a Matcher using a lambda. And usually, it's hard to come up with a good implementation of describeToanyway.