add support for outputting flow types - fixes #665

test/fixtures/generation/flow/interfaces-module-and-script/expected.js

@@ -0,0 +1,9 @@
+interface A {};
+interface A extends B {};
+interface A<T> extends B<T>, C<T> {};
+interface A { foo(): number };
+interface Dictionary { length: number; [index: string]: string };
+class Foo implements Bar {}
+class Foo extends Bar implements Bat, Man<number> {}
+class Foo extends class Bar implements Bat {} {}
+class Foo extends class Bar implements Bat {} implements Man {}