command line script launcher

% ./bin/kotlin -script hello.ktscript
hello world

% cat hello.ktscript
fun hello(what: String) = println("hello $what")
hello("world")

Note it currently takes 8 seconds to evaluate hello world script.

compiler/integration-tests/data/script/hello.ktscript

@@ -0,0 +1 @@
+println("hello world")