generate bytecode for script

It is just prototype

* does not make top level symbols visible as class members yet
* does not take parameters
* Script class name is hardcoded now

compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/JdkNames.java

@@ -22,5 +22,6 @@ package org.jetbrains.jet.lang.resolve.java;
 public class JdkNames {
 
     public static final JvmClassName JL_OBJECT = new JvmClassName("java.lang.Object");
+    public static final JvmClassName JL_STRING = new JvmClassName("java.lang.String");
 
 }