Change the backend port to 8080. (#798)

This makes the setup easier since this is the default port.

ui/README.md

@@ -16,14 +16,14 @@ to get the dependencies for our React app.
 Once you have everything, the easiest way to develop the UI is to run two local
 servers:
 
-1. Run the Django (backend) server as usual, at port 8000.
+1. Run the Django (backend) server as usual, at port 8080 (default).
 2. Enable the React UI support (currently disabled by default) in the backend by
    setting `enable_react_ui` config to True:
     ```
-    $ ./tools/console localhost:8000
+    $ ./tools/console localhost:8080
     > config.set(enable_react_ui=True)
     ```
-3. Run the UI with `tools/ui run`. It will talk to the backend at port 8000 when
+3. Run the UI with `tools/ui run`. It will talk to the backend at port 8080 when
    it needs to make API calls. There is currently an issue with uploaded photos:
    the Webpack dev server is not set up to proxy requests for photo URLs, but it
    also can't serve the photos on its own, so photos will not correctly appear

ui/webpack.dev.js

@@ -31,7 +31,7 @@ module.exports = merge(common, {
     contentBase: path.join(__dirname, 'static/'),
     proxy: {
       '/*/d/**': {
-        target: 'http://localhost:8000',
+        target: 'http://localhost:8080',
         secure: false
       }
     },