feat(reorganize): export Subject, ReplaySubject, BehaviorSubject from rxjs

Author: benlesh

spec/index-spec.ts

@@ -126,4 +126,10 @@ describe('index', () => {
     expect(index.withLatestFrom).to.exist;
     expect(index.zipAll).to.exist;
   });
+
+  it('should export the Subject types', () => {
+    expect(index.Subject).to.exist;
+    expect(index.BehaviorSubject).to.exist;
+    expect(index.ReplaySubject).to.exist;
+  });
 });

src/index.ts

@@ -127,3 +127,8 @@ export { windowToggle } from './operators/windowToggle';
 export { windowWhen } from './operators/windowWhen';
 export { withLatestFrom } from './operators/withLatestFrom';
 export { zipAll } from './operators/zipAll';
+
+/* Subjects */
+export { Subject } from './Subject';
+export { BehaviorSubject } from './BehaviorSubject';
+export { ReplaySubject } from './ReplaySubject';