inlined invocationOf Matcher
moved Invocations to util package
removed @Nullable from implementations of Matcher and Handler
renamed Captor -> InvocationMatcher
made exactly() implement Matcher
removed warning about dangerous toString
refactored prestubbing of mocks
implemented canRepair instead of throwing exception
implemented hasLastWhenEffect instead of throwing exception
implemented getStubbedHandlerFor with precondition check
implemented canMockOrSample
fixed stacktrace of assertion errors from thenCalled()