- Added ability to create a test user that expires after a specified amount of time
- Created UserManager class to scan for a purge expired users periodically
- Added "created_time" and "deleted_time" to the user table
- Fixed the universal and local unix timestamp extension methods (for some reason needed to swap their implementations to get the correct timestamps)
- Fixed 
- Converted remaining singleton classes to static classes
- Renamed the WaveBox.Singletons namespace to WaveBox.Static
- Fixed broken ResetRunDateTime method in AbstractOperation