add new template folder

The add new templates page now has option to add template folders.
Tweaked wording of other options and h1 to clarify options since it's
not all about templates any more.

Added api client and stuff for it

app/notify_client/service_api_client.py

@@ -1,4 +1,3 @@
-from __future__ import unicode_literals
 
 from app.notify_client import NotifyAdminAPIClient, _attach_current_user, cache
 

app/notify_client/template_folder_api_client.py

@@ -0,0 +1,28 @@
+from app.notify_client import NotifyAdminAPIClient, cache
+
+
+class TemplateFolderAPIClient(NotifyAdminAPIClient):
+    # Fudge assert in the super __init__ so
+    # we can set those variables later.
+    def __init__(self):
+        super().__init__('a' * 73, 'b')
+
+    @cache.delete('service-{service_id}-template-folders')
+    def create_template_folder(
+        self,
+        service_id,
+        name,
+        parent_id=None
+    ):
+        data = {
+            'name': name,
+            'parent_id': parent_id
+        }
+        return self.post('/service/{}/template-folder'.format(service_id), data)['data']['id']
+
+    @cache.set('service-{service_id}-template-folders')
+    def get_template_folders(self, service_id):
+        return self.get('/service/{}/template-folder'.format(service_id))['data']
+
+
+template_folder_api_client = TemplateFolderAPIClient()