Allow specification beautify options in tests

Caught an error in #847 as well - `output` wasn't passed anywhere which led to an exception. `options` was available though.

test/compress/screw-ie8.js

@@ -0,0 +1,18 @@
+do_screw: {
+    options = { screw_ie8: true };
+    beautify = {
+        screw_ie8: true,
+        ascii_only: true
+    };
+
+    input: f("\v");
+    expect_exact: 'f("\\v");';
+}
+
+dont_screw: {
+    options = { screw_ie8: false };
+    beautify = { screw_ie8: false, ascii_only: true };
+
+    input: f("\v");
+    expect_exact: 'f("\\x0B");';
+}