Developer's Guide
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 * [How to run from source tree](how_to_run.md)
 * [Directory Structure](directory.md)
 * [Mapping and Validation](mapping_and_validation.md)
 * [Authentication in Controller](authentication.md)
 * [About Action in Issue Comment](comment_actionb.md)
 * [Activity Types](activity.md)
 * [Notification Email](notification.md)
 * [Automatic Schema Updating](auto_update.md)