Added database connection with a sqlite database.

Module db for connection to a sqlite is added with initialization
and get/save functions.
Functionality for saving properties is added as well.
Started to add proper functionality for GUI.

 Incheckare: marcux <marcux@localhost.localdomain>

 På grenen master
 Ändringar att checka in:
   (använd "git reset HEAD <fil>..." för att ta bort från kö)

	ny fil:     db/__init__.py
	ny fil:     db/db_connection.py
	ny fil:     db/wdiary.activities
	ny fil:     db/wdiary.db
	ny fil:     db/wdiary.properties
	ny fil:     db/wdiary.titles
	ny fil:     diary.py
	ändrad:     ui/editDiaryDialog.py
	ändrad:     ui/mainWindow.py
	ändrad:     ui/optionDialog.py