typo
Initial version of a stream decorator for sequential streams.
According to Lisp's list construction function `cons` and the empty list
`nil`, we name the corresponding Java classes `Cons` and `Nil`. The name
of the list interface remains `List`.
See also http://en.wikipedia.org/wiki/Cons and
http://www.slideshare.net/IgnasiMarimonClos/functional-programming-in-java-8