SQLite support

1- SQLite support for DbUp added
2- New ScriptExectuor, TableJournal specifically for SQLite added, however I still think a share/base class can be used for all db providers (sql server, oracle, sqllite) to keep the shared code across providers; (could be done in a refactoring phase later)
3- A SQLite sample application added that can be use to see the integration in action.

Cheers,
Hojjat