Version 1.5 released

Updated PyQt to 5.3.2 and Python to 3.4.2
Implemented Search box in column filter dialog
Export to mobile
New options for sorting items in left-side tree panel and in column filter dialog
Improved reference editor, possible for adding icons to period
Improved main menu panel
New options on installation: enable check updates and associate *.db files
Added Italian translations (by Teroknor)
Added Polish translations (by Nazzy)