Modified database tables for zones and components.  Removed the id's and used foreign keys for components table.  Added ON DELETE CASCADE to components table.

Updated classes for zones and components to reflect changes to database tables.

Removed unused import statements and cleaned up code.
Merge pull request #2 from shultzam/master

Merge pull request #1 from surfsnowpro/master
Merge pull request #2 from surfsnowpro/master

Update from Master