It is POLL_INTERVAL, not POLL_DELAY

Author: matthiask

README.md

@@ -81,7 +81,7 @@ WEBPACK_LOADER = {
  'DEFAULT': {
  'BUNDLE_DIR_NAME': 'webpack_bundles/', # must end with slash
  'STATS_FILE': 'webpack-stats.json',
- 'POLL_DELAY': 0.1,
+ 'POLL_INTERVAL': 0.1,
  'IGNORE': ['.+\.hot-update.js', '.+\.map']
  }
 }