Added class UrlCreator

Use this class for creating the initial URL that makes you login with your
Google credentials and allow the app to access the specific scope's data
Added UrlCreator to dispatcher
Ensure table exists

Since PDO creates a Sqlite3 as a default setting if it does not exists, a
private function was added which ensures the table exists as specified in the
config.ini
Removed explicit public declaration from functions
Added unit tests and Makefile
Created tests directory
Added and refactored tests
Added test config in XML, refactored Makefile
Completed SqliteStoreTest