Most awesome FP libraries (Cats, Scalaz, Monocle, Algebird etc ) have microsite done by sbt-microsites

Adding one for Shapeless would make it easier for newcomers. Quick, online reference on what is available

It should cover when you'd use and how to use:

• parEvalMap/Unordered
• parJoin
• concurrently
• merge*

There's the page on Queue/Topic/etc but there's not a great single page on the operations directly on Stream. The Guide section on concurrency is very short and doesn't cover some of the most common operations (parEvalMap especially)

We can add Lazy<a> = () => A protocol to returns.primitives.types

This might be helpful when working with IO when someone want to slow things down.
One should use Protocol and __call__ to model this type.

This is a followup for #1077. The machinery for enhanced exceptions relies on several List and Array functions to manipulate the stack trace of exceptions. There isn't going to be a noticeable performance hit for anyone, but I think we can probably write a more efficient implementation.