Move the js module to a js_sys crate (#512)

* Move the `js` module to a `js_sys` crate

* Update js-sys tests to pass again

* Update binding_to_unimplemented_apis_doesnt_break_everything

Remove its dependency on the `js` module

* Update metadata for js-sys

* Fix the `closures` example

crates/js-sys/tests/all/Intl.rs

@@ -0,0 +1,34 @@
+#![allow(non_snake_case)]
+
+use project;
+
+#[test]
+fn get_canonical_locales() {
+    project()
+        .file("src/lib.rs", r#"
+            #![feature(use_extern_macros)]
+
+            extern crate wasm_bindgen;
+            extern crate js_sys;
+            use wasm_bindgen::prelude::*;
+
+            #[wasm_bindgen]
+            pub fn get_canonical_locales(v: &JsValue) -> js_sys::Array {
+                js_sys::Intl::get_canonical_locales(v)
+            }
+        "#)
+        .file("test.js", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                let locales = ["EN-US", "Fr"];
+                let canonical_locales = wasm.get_canonical_locales(locales);
+                assert.deepStrictEqual(canonical_locales, ["en-US", "fr"]);
+
+                let single_locale = wasm.get_canonical_locales("EN-US");
+                assert.equal(single_locale, "en-US");
+            }
+        "#)
+        .test()
+}