Introducing new CoreData model, now based on SQLITE, and more.

- Externalized CoreData operations in a singleton
- Helper for CSV operations
- Fixing issue #3 with password encryption
Adding Import From CSV feature, issue #15

- Adding helpers functions to Password entity
Adding security to export, issue #14

- Adding new lib STPrivilegedTask
- Adding support for ARC on the lib
Updating iconset for Beta and bundle version