E language

This is a follow up to #389. The [E language][wp] (not to be confused with the [e Verification Language][evl]) is used on GitHub, for example in [acmeism/RosettaCodeData][http.e]. It’s hard to find some samples because of the case-insensitive search (Eiffel’s and e’s primary extensions are both `.e`) and the short name. It has various implementations, written in [Haskell][hs], [Java and Common Lisp][qstart].

[wp]: https://en.wikipedia.org/wiki/E_(programming_language)
[evl]: https://en.wikipedia.org/wiki/E_(verification_language)
[http.e]: https://github.com/acmeism/RosettaCodeData/blob/6f050a029e46f0c2c0e0c12c8c15ffdb543af9c5/Task/HTTP/E/http.e
[hs]: https://bitbucket.org/nejucomo/eonhs/wiki/Home
[qstart]: http://erights.org/#quickstart