fix BYOR config

etc/byor_config.py

@@ -3,3 +3,7 @@
 load_subconfig('etc/github_auth.py')
 
 c.JupyterHub.spawner_class = 'everware.ByorDockerSpawner'
+
+from os.path import join as pjoin
+with open(pjoin(c.JupyterHub.template_paths[0], '_byor_options_form.html')) as form:
+    c.CustomDockerSpawner.options_form = form.read()