Renamed FuncMatcherWrapper to MatcherFunc.
Updated README.
Moved stringers to their own file.
Moving code around.
Moved _doubleAsString to be with the other stringers.
Ranamed FailureMessage.build() -> FailureMessage.stringValue()
Whitespace.
Removed ==(Expectation<Double>, Double) operator.

This isn't intuitive or discoverable that this behavior existed. May re-address later.