Add tests for plume webserver (#513)

* begin setup front-end test environment with selenium
* run migrations before tests
* use https for tests

script/browser_test/instance.py

@@ -0,0 +1,7 @@
+#!/usr/bin/python3
+from utils import Browser
+
+class InstanceName(Browser):
+    def test_name_in_title(self):
+        self.get("/")
+        self.assertIn("plume-test", self.driver.title)