Regression: log-folder parameter in serve-branches doesn't work

Running serve-branches --log-folder /tmp yields:

/home/pbui/src/other/loggerhead/trunk/loggerhead/search.py:20: DeprecationWarning: the sets module is deprecated
  import sets
Traceback (most recent call last):
  File "../../src/other/loggerhead/trunk/serve-branches", line 149, in <module>
    main(sys.argv)
  File "../../src/other/loggerhead/trunk/serve-branches", line 80, in main
    config.get_option['log_folder'], 'serve-branches.log')
TypeError: 'instancemethod' object is unsubscriptable

Fix is to do config.get_option('log_folder') instead of config.get_option['log_folder']