Describe only failed matchers in AnyOf

[corbym]

AnyOf reports all matcher's descriptions when it fails.

Given a number of matchers, when less than all of them fail, we should only report the description of the failing matchers.

[jpolack]

Would be a nice feature, because if I understand right the description has to be changed based on the childMatchers' .Matches result.

Enabling this would make possible to write better descriptions/actuals in general

[corbym]

not sure what I was thinking here, cause it makes no sense for anyOf to fail matching less than all - its criteria is to match ANY of the matchers and pass. I must have meant AllOf..