Implement new create and manager trigger UI

Implements the new trigger setup user interface, which is now a linear workflow found on its own page, rather than a tiny modal dialog

Fixes #1187

endpoints/web.py

@@ -183,6 +183,13 @@ def confirm_invite():
 def repository(path):
   return index('')
 
+
+@web.route('/repository/<path:path>/trigger/<trigger>', methods=['GET'])
+@no_cache
+def buildtrigger(path, trigger):
+  return index('')
+
+
 @web.route('/starred/')
 @no_cache
 def starred():
@@ -659,9 +666,7 @@ def attach_custom_build_trigger(namespace_name, repo_name):
                                                None, current_user.db_user())
 
     repo_path = '%s/%s' % (namespace_name, repo_name)
-    full_url = '%s%s%s' % (url_for('web.repository', path=repo_path), '?tab=builds&newtrigger=',
-                           trigger.uuid)
-
+    full_url = url_for('web.buildtrigger', path=repo_path, trigger=trigger.uuid)
     logger.debug('Redirecting to full url: %s', full_url)
     return redirect(full_url)