Sicness/levitan — pull request #5 by ka2m (2014-10-30 14:35:59+00:00)
Title: Plugin loading improvements

* Override policies for `check_plugin_config()` and `plugin_process_request()` updated. Plugins **must** override `check_plugin_config()`, otherwise check status if `False`. Plugins **can** avoid overriding `plugin_process_request()`, if it doesn't differ from template one.
* Fix plugin classes loading due to bug, found by Anton
* Fix nameing