added support for java.io.Closeable as a standard interface

Author: jstrachan

js/js.libraries/src/core/javaio.kt

@@ -2,3 +2,8 @@ package java.io
 
 library
 public class IOException(message: String = "") : Exception() {}
+
+library
+public trait Closeable {
+    public open fun close() : Unit;
+}

js/js.translator/testFiles/kotlin_lib.js

@@ -248,6 +248,12 @@ var kotlin = {set:function (receiver, key, value) {
         append: throwAbstractFunctionInvocationError("Appendable#append")
     });
 
+    Kotlin.Closeable = Kotlin.$createClass({
+        initialize: function () {
+        },
+        close: throwAbstractFunctionInvocationError("Closeable#close")
+    });
+
     Kotlin.parseInt = function (str) {
         return parseInt(str, 10);
     };