ClojureScript reporter should print to remote repl, not console.log

[dustingetz]

We want https://github.com/dustingetz/missionary-quickstart to print to the REPL window not browser, but the default reporter uses console.log. Was there a reason for this? AFAICT this is because (print "✅") does not flush in ClojureScript ever unless followed by a newline. flush in CLJS is noop.