Tweaked Matchers Scaladoc. Made implicit in PrettyMethods a PrettyConfig to get the
Any => String conversion non-implicit, because that can be accidentally applied
all over the place.
Added a test showing a composition of two Prettifiers. Already worked.
Will wait for more actual use cases before adding more.
Tweaked Matcher Scaladoc. Added a commented out test in ShouldBeSymbolSpec.
Changed all MatchResult in BeWord to construct error message lazily.
Changed all MatchResult in ContainWord to construct error message lazily.
Changed all MatchResult in EndWithWord to construct error message lazily, and fixed inconsistency in error messages of endWith regex withGroup(s).