[Feature Request] Support for shebang line and clojure scripting

[phillord]

It would be nice to have better support for writing clojure scripts.

For example, boot provides shebag support so a script might look like this:

 #!/usr/bin/env boot
 (println "hello world")

But the shebang line confuses syntax highlighting. It would be nice if clojure mode understood first line shebang lines!

[bbatsov]

I think this should be a clojure-mode ticket. Probably we can also add some command to run a script.