willContinueTo incorporated into unit tests for matchers

This will also aid in the documentation of will/willNot behaviour that can lead to false passing.
More willContinueTo tests
Final willContinueTo tests
Documenting willNotContinueTo
Fix erroneous usage of method_setImplementation
Merge pull request #16 from lawrencelomax/willcontinue-expect

willContinueTo added to EXPExpect