Only recheck shrunken input

[TysonMN]

Resolves #332

...at least that is my plan. It is not there yet. So far, this branch adds Lazy<> to the definition of Property<>. I think that is the right first step to being able to avoid executing the test on non-shrunken inputs.

@dharmaturtle, can you help me with this? I got the Hedgehog project to compile. Can you make all projects compile?

[TysonMN]

Yep @adam-becker. I did that so that I could submit issue Zaid-Ajaj/Fable.Mocha#38.

@ThisFunctionalTom, I think that is why the Fable test is failing. My assertion depends on the contents of the error message but Mocha isn't including the same information as Expecto in the error message.

[TysonMN]

@adam-becker, I just force pushed the dropping of that temp commit. All the .NET tests now pass. One JS test fails because my assertion is "too strong" (not because their is a problem in the production code).

The easies workaround is to drop that second assertion. If I took that approach, then I would only drop it for Fable. This issue with Mocha isn't preventing me from making progress on this feature at the moment (other than the small amount of time today to investigate the problem), so I will ignore it for a while as I continue working on this feature.

[TysonMN]

This PR is now ready for review. It needs some clean up at least in Property.reportRecheckWith. Also need to add a change log entry.

[TysonMN]

Force pushed after rebasing on master, to which was just added the code in PR #386. The code is much cleaner. Still more cleaning to do though.

[TysonMN]

I am happy with everything now. I squashed the commits I recently pushed into their respective places. Then I reviewed all changes via GitHub and ran tests locally on every commit.

[dharmaturtle]

LGTM!