Revert "Now only saving context if it has changes."

This reverts commit 157de4b45c2c47bd6f80b7541fd69c56d9d4910f.
Revert "Now auto saving background context."

This reverts commit 96878681b63b01a95b3a87aafb5f561832774c6c.
Revert "Adopts 3-NSManagedObjectContexts concept."

This reverts commit ced327d2965b02e998b457e6a5f2c2a4badd9f95.