Use werkzeug DispatcherMiddleware for apps

We have 2 apps now within same application, one is for api and second
one is for frontend, we will use DispatcherMiddleware to register both
these apps into single WSGI frontend.

Signed-off-by: Vasudev Kamath <kamathvasudev@gmail.com>

wsgi.py

@@ -0,0 +1,7 @@
+from werkzeug.serving import run_simple
+from werkzeug.wsgi import DispatcherMiddleware
+
+from silpa import api, frontend
+
+application = DispatcherMiddleware(frontend.create_app(),
+                                   {'/api': api.create_app()})