Added backend /login and /register routes.

These are required for clients that don't have JS enabled and will get a
404 otherwise.

The routes simply render `index.html`, which will be empty if JS is
disabled and will redirect to the appropriate login/registration Vue
route if the user isn't logged in.

platypush/backend/http/app/routes/index.py

@@ -14,8 +14,26 @@ __routes__ = [
 
 @index.route('/')
 @authenticate()
-def index():
+def index_route():
-    """ Route to the main web panel """
+    """Route to the main web panel"""
+    return render_template('index.html', utils=HttpUtils)
+
+
+@index.route('/login', methods=['GET'])
+def login_route():
+    """
+    Login GET route. It simply renders the index template, which will
+    redirect to the login page if the user is not authenticated.
+    """
+    return render_template('index.html', utils=HttpUtils)
+
+
+@index.route('/register', methods=['GET'])
+def register_route():
+    """
+    Register GET route. It simply renders the index template, which will
+    redirect to the registration page if no users are present.
+    """
     return render_template('index.html', utils=HttpUtils)