Return results from experiment

[paulbreen]

Scientist is designed to always return results from the control, however during development I have found it helpful to return the result from the candidate rather than the control, i.e. during design and debugging an issue etc.

The following PR exposes a delegate that will can effectively ignore the control and return the result from the first candidate. It has similar affects to turning off Scientist i.e. no comparison reports are generated, no over head etc

using GitHub;

...

public void ScientistSetup(){
   Scientist.EnabledControl(() => !HostingEnvironment.IsDevelopmentEnvironment);
}

public bool UseExperimentResult(IUser user)
{
    return Scientist.Science<bool>("widget-permissions", experiment =>
    {
        experiment.Use(() => IsCollaborator(user)); // control
        experiment.Try(() => HasAccess(user)); // candidate
    }); // returns the candidate value
}