Set custom template settings when using roundup-demo

Some templates like `jinja2` and `responsive` need certain settings in
their `config.ini` otherwise the pages won't display correctly. By
pulling in these custom settings when running `roundup-demo` we ensure
that the pages will display correctly out of the box with no extra
changes required.

Author: jerrykan

roundup/demo.py

@@ -39,7 +39,10 @@ def install_demo(home, backend, template):
     from roundup import init, instance, password
 
     # set up the config for this tracker
-    config = configuration.CoreConfig()
+    template_cfg = configuration.UserConfig(template + "/config_ini.ini")
+    config = configuration.CoreConfig(settings={
+        i.name: i.get() for i in template_cfg.items()
+    })
     config['TRACKER_HOME'] = home
     config['MAIL_DOMAIN'] = 'localhost'
     config['DATABASE'] = 'db'