Metacat

Change location of PropertyService to properties directory

Create database and shared directories for database management code and shared code respectively.

Implement stop method in services. Stop all services when shutting down metacat. This primarily keeps scheduler from hanging with open threads.

Implement refresh methods inherited from base class

Change the ServiceInterface into a base class called BaseService. All services extend BaseService.

Fix comments

Move the DBAdaptor accessor into a DatabaseService class