Update to use dnx kestrel for web apps

Author: DamianEdwards

README.md

@@ -69,7 +69,7 @@ You should also be able to run `dnx` and see the help text of the `dnx` command.
 4. You should see a bunch of output as all the dependencies of the app are downloaded from MyGet.
 5. Run the sample using the appropriate DNX command:
     - For the console app run  `dnx run`.
-    - For the web apps run `dnx web` on Windows or `dnx kestrel` on OS X/Linux.
+    - For the web apps run `dnx kestrel`.
 6. You should see the output of the console app or a message that says the site is now started.
 7. You can navigate to the web apps in a browser by navigating to `http://localhost:5001` or `http://localhost:5004` if running on OS X/Linux.