Add new icons confirming to harmattan ui styles

The icons were designed and provided by Nuno Pinheiro

A +- -- mobile/calendar/hi80-apps-korganizer-mobile-harmattan.png
A +- -- mobile/contacts/hi80-apps-kaddressbook-mobile-harmattan.png
A +- -- mobile/mail/hi80-apps-kmail-mobile-harmattan.png
A +- -- mobile/notes/hi80-apps-notes-mobile-harmattan.png
A +- -- mobile/tasks/hi80-apps-tasks-mobile-harmattan.png